fix(eslint-plugin): [no-unused-vars] check if any variable definition is exported

[Maxim-Mazurok]

PR Checklist

• Addresses an existing open issue: fixes Bug: [no-unused-vars] false positive if name is type/value merged and exported #6188
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

As per #6188 (comment) suggestion, instead of checking the first declaration of a variable to determine if it's exported or not, I'm checking all declarations. Test included.

[typescript-eslint]

Thanks for the PR, @Maxim-Mazurok!

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!

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• Node 16 - nx run types:build
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• Node 16 - nx test ast-spec --coverage=false
• nx test eslint-plugin-internal --coverage=false
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[codecov]

Codecov Report

Merging #6873 (167de44) into main (a9d7bb1) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6873      +/-   ##
==========================================
- Coverage   87.47%   87.47%   -0.01%     
==========================================
  Files         379      379              
  Lines       13230    13228       -2     
  Branches     3906     3905       -1     
==========================================
- Hits        11573    11571       -2     
  Misses       1279     1279              
  Partials      378      378              

Flag	Coverage Δ
unittest	87.47% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...s/eslint-plugin/src/util/collectUnusedVariables.ts	93.10% <100.00%> (-0.06%)	⬇️

... and 1 file with indirect coverage changes

[JoshuaKGoldberg]

Super, thanks! Implementation looks great 🙌 - just requesting changes on a teeny bit more testing (unless I missed it already existing?).

[JoshuaKGoldberg]

Super, thanks @Maxim-Mazurok! This looks clean and great. And the extra tests are always lovely, much appreciated!

Aside - my apologies for taking so long without getting back to you. I got sidetracked during the v6 work and dropped priority on the PR queue. But I should have let you know (or, honestly, just reviewed this PR - it's a pretty straightforwardly great one). Sorry about that!