chore(eslint-plugin): remove unused indent fork

[bradzacher]

PR Checklist

• Addresses an existing open issue: ref [indent][meta issue] Problems with the indent rule #1824, Enhancement: migrate functional-red-black-tree to js-sdsl #5624
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

We ship all of this code with our releases, even though it's not possible for someone to actually use the rule.

This fork has been in the codebase for over 3 years (#439). The issue (#1824) has been open asking for help for over 2 years.
The latest version of the core lint rule (released in ESLint v8.23.1) no longer uses the functional-red-black-tree package, so we also now install a unique dependency that we don't actually use. Previously this was fine because ESLint core used it, but it's no longer going to be the case!

I'm comfortable removing this unused code entirely at this time.
When (if) a community member decides to help us with the fork, they can start by reverting this PR as the base for the work, though they'll probably want to just freshly fork the core rule and work from there, rather than attempting to merge 3 years of upstream changes into this dead code.

This saves us from having to maintain almost 12k lines of code!

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit f6eaefc. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

---

✅ Successfully ran 47 targets

• Node 18 - nx test @typescript-eslint/eslint-plugin
• Node 14 - nx test @typescript-eslint/eslint-plugin --coverage=false
• nx run-many --target=build --all --parallel --exclude website
• Node 18 - nx test @typescript-eslint/visitor-keys
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx test @typescript-eslint/utils
• nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx test @typescript-eslint/type-utils
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• nx run-many --target=build --all --parallel --exclude website --exclude website
• nx run-many --target=typecheck --all --parallel
• Node 14 - nx test @typescript-eslint/eslint-plugin-tslint --coverage=false
• Node 18 - nx test @typescript-eslint/eslint-plugin-tslint
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx test @typescript-eslint/eslint-plugin-internal
• Node 14 - nx test @typescript-eslint/typescript-estree --coverage=false
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx test @typescript-eslint/eslint-plugin-internal --coverage=false
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx test @typescript-eslint/scope-manager --coverage=false
• Node 18 - nx test @typescript-eslint/typescript-estree
• Node 18 - nx test @typescript-eslint/ast-spec
• Node 14 - nx test @typescript-eslint/visitor-keys --coverage=false
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx test @typescript-eslint/utils --coverage=false
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx test @typescript-eslint/parser --coverage=false
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx test @typescript-eslint/type-utils --coverage=false
• Node 18 - nx test @typescript-eslint/scope-manager
• Node 14 - nx test @typescript-eslint/ast-spec --coverage=false
• Node 18 - nx test @typescript-eslint/parser
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 14 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• Node 18 - nx run-many --target=build --all --parallel --exclude website --exclude website
• nx run-many --target=build --all --parallel --exclude website --exclude website
• nx run-many --target=build --all --parallel --exclude website --exclude website
• nx run-many --target=build --all --parallel --exclude website --exclude website

---

Sent with 💌 from NxCloud.

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

---

🙏 Please, if you or your company is finding typescript-eslint valuable, help us sustain the project by sponsoring it transparently on https://opencollective.com/typescript-eslint. As a thank you, your profile/company logo will be added to our main README which receives thousands of unique visitors per day.

[netlify]

✅ Deploy Preview for typescript-eslint ready!

Name	Link
🔨 Latest commit	f6eaefc
🔍 Latest deploy log	https://app.netlify.com/sites/typescript-eslint/deploys/631ecd2bde4d4e00098062b4
😎 Deploy Preview	https://deploy-preview-5625--typescript-eslint.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[codecov]

Codecov Report

Merging #5625 (f6eaefc) into main (bd4a7a6) will increase coverage by 1.96%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5625      +/-   ##
==========================================
+ Coverage   91.63%   93.59%   +1.96%     
==========================================
  Files         134      288     +154     
  Lines        1506     9575    +8069     
  Branches      226     2880    +2654     
==========================================
+ Hits         1380     8962    +7582     
- Misses         62      334     +272     
- Partials       64      279     +215     

Flag	Coverage Δ
unittest	93.59% <ø> (+1.96%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ackages/eslint-plugin/src/rules/prefer-as-const.ts	100.00% <0.00%> (ø)
...es/eslint-plugin/src/rules/no-use-before-define.ts	93.39% <0.00%> (ø)
...ackages/eslint-plugin/src/rules/no-implied-eval.ts	97.05% <0.00%> (ø)
...nt-plugin/src/rules/switch-exhaustiveness-check.ts	97.95% <0.00%> (ø)
...gin/src/rules/non-nullable-type-assertion-style.ts	100.00% <0.00%> (ø)
...ackages/eslint-plugin/src/rules/prefer-readonly.ts	99.08% <0.00%> (ø)
packages/eslint-plugin/src/rules/no-loop-func.ts	98.11% <0.00%> (ø)
packages/eslint-plugin/src/configs/strict.ts	100.00% <0.00%> (ø)
...c/rules/no-non-null-asserted-nullish-coalescing.ts	91.66% <0.00%> (ø)
packages/eslint-plugin/src/rules/comma-spacing.ts	100.00% <0.00%> (ø)
... and 144 more

[JoshuaKGoldberg]

This is going to be nice for the install size!