fix(eslint-plugin): [no-unused-vars] ignore imports used only as types

[jakebailey]

PR Checklist

• Addresses an existing open issue: fixes Bug: In v8, no-unused-vars says "defined but only used as type" on import with no escape hatch #9679
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

If usedOnlyAsType, then ignore the variable if it came from an import definition. This showed that there were existing tests which encoded the old behavior, which I updated.

The second commit moves some code slightly to avoid extra work now that this loop can continue.

Due to #9688, I had to commit with --no-verify, so hopefully this passes CI.

[typescript-eslint]

Thanks for the PR, @jakebailey!

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.07%. Comparing base (c3f9dcd) to head (4190828).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9694   +/-   ##
=======================================
  Coverage   88.06%   88.07%           
=======================================
  Files         402      402           
  Lines       13687    13691    +4     
  Branches     3980     3982    +2     
=======================================
+ Hits        12054    12058    +4     
  Misses       1324     1324           
  Partials      309      309           

Flag	Coverage Δ
unittest	88.07% <100.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
packages/eslint-plugin/src/rules/no-unused-vars.ts	99.00% <100.00%> (+0.02%)	⬆️

[JoshuaKGoldberg]

LGTM, thanks for the quick PR! ⚡

[kirkwaiblinger]