feat(eslint-plugin): [prefer-string-starts-ends-with] add allowSingleElementEquality option

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes Enhancement: [prefer-string-starts-ends-with] Option to ignore [0] === cases? #7140
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Adds a new allowSingleElementEquality option to the rule that's allowed to be 'never' (default) or 'always'.

Doesn't yet add a third option for case matching as described in the issue. Is that ok to leave as a followup?

Also removes the auto-generation of tests from prefer-string-starts-ends-with.test.ts per #6887. The test file predates that preference.

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

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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✅ Successfully ran 30 targets

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• nx run types:build
• nx run repo-tools:postinstall-script
• nx test utils
• nx test typescript-estree
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• nx test type-utils
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• nx test rule-schema-to-typescript-types
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint
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• nx test ast-spec
• nx test eslint-plugin-internal
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• nx test rule-schema-to-typescript-types --coverage=false
• nx test scope-manager --coverage=false
• nx test repo-tools --coverage=false
• nx test type-utils --coverage=false
• nx test typescript-estree --coverage=false
• nx test eslint-plugin-internal --coverage=false
• nx test typescript-eslint --coverage=false
• nx test visitor-keys --coverage=false
• nx test ast-spec --coverage=false
• nx test parser --coverage=false
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.14%. Comparing base (4c8b06d) to head (b9e88f0).

❗ Current head b9e88f0 differs from pull request most recent head 1573b1c. Consider uploading reports for the commit 1573b1c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8374   +/-   ##
=======================================
  Coverage   87.13%   87.14%           
=======================================
  Files         251      251           
  Lines       12269    12272    +3     
  Branches     3869     3871    +2     
=======================================
+ Hits        10691    10694    +3     
  Misses       1306     1306           
  Partials      272      272           

Flag	Coverage Δ
unittest	87.14% <100.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
...plugin/src/rules/prefer-string-starts-ends-with.ts	97.46% <100.00%> (+0.03%)	⬆️
...s/eslint-plugin/src/util/collectUnusedVariables.ts	93.13% <100.00%> (ø)

[auvred]

Looks great! 🔥