fix(devkit): executor-to-plugin-migrator should add // targets hint

[Coly010]

Current Behavior

When convert-to-inferred generators are run, they leave no hints as to what happened to the targets.
This is usually fine as the person running the generator should know what it is doing.
However, other team members who may not have been privy to the migration may be confused when they see an empty project.json

Expected Behavior

Add the same // targets hint that we generate for plugin-first projects to help guide users to the PDV to see the targets.

Related Issue(s)

Fixes #

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	May 3, 2024 2:19pm

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit 7f6abce. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

✅ Successfully ran 6 targets

• nx affected --targets=e2e,e2e-ci --base=21d7e9221d77f95221e5085eee3cce573efbeba8 --head=7f6abce8c64e505a13da5728b5c8f2fc10e47b73 --parallel=1
• nx affected --targets=lint,test,build --base=21d7e9221d77f95221e5085eee3cce573efbeba8 --head=7f6abce8c64e505a13da5728b5c8f2fc10e47b73 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=21d7e9221d77f95221e5085eee3cce573efbeba8 --head=7f6abce8c64e505a13da5728b5c8f2fc10e47b73
• nx documentation --no-dte
• nx affected -t e2e-macos-ci --parallel=1 --base=21d7e9221d77f95221e5085eee3cce573efbeba8 --head=7f6abce8c64e505a13da5728b5c8f2fc10e47b73

---

Sent with 💌 from NxCloud.

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.