Remove @remix-run/eslint-config references from unit test fixtures

[brophdawg11]

Forked off from #7597 since this touches unit tests so should technically merge to dev. The unit tests are testing remix dev behavior so linting is irrelevant in the fixtures

[changeset-bot]

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Latest commit: fc07124

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[github-actions]

🤖 Hello there,

We just published version 2.4.1-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 2.4.1 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!