chore(CI): simplify testing strategy

[MichaelDeBoey]

Just like I did in eslint-community/eslint-plugin-mysticatea#1 & eslint-community/eslint-plugin-eslint-plugin#313

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@e8eabf4). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

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##             main      #378   +/-   ##
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  Coverage        ?   100.00%           
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  Files           ?        25           
  Lines           ?       626           
  Branches        ?       242           
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  Hits            ?       626           
  Misses          ?         0           
  Partials        ?         0           

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[ota-meshi]

I think we probably need to remove the jest-runner-eslint config and dependencies.

[ota-meshi]

LGTM! Thank you!

[github-actions]

🎉 This PR is included in version 6.1.0 🎉

The release is available on:

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

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