fix: corrected setup for blockESLintPlugin

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: ESLint failures creating a new repo with blockESLintPlugin #2195
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Switches the default README.md usage to a defaultUsage Addon, then pipes blockTypeScript's example files through blockExample. That way --exclude-example-files gets them out of the way so that --add-eslint-plugin can swap in the eslint-doc-generator table.

🎁

[github-actions]

PR Compliance Checks Passed!

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.80%. Comparing base (6062f49) to head (b49a201).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/blocks/blockREADME.ts	66.66%	1 Missing ⚠️
src/options/readReadmeUsage.ts	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2196      +/-   ##
==========================================
- Coverage   99.83%   99.80%   -0.04%     
==========================================
  Files         135      134       -1     
  Lines        5971     6001      +30     
  Branches      497      499       +2     
==========================================
+ Hits         5961     5989      +28     
- Misses         10       12       +2     

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[github-actions]

🎉 This is included in version v2.40.1 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀