feat!: drop React 17 support

[MichaelDeBoey]

@pcattori & @ryanflorence mentioned in #7021 that we would do this

[changeset-bot]

🦋 Changeset detected

Latest commit: 8612ac7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 16 packages

Name	Type
@remix-run/dev	Major
@remix-run/eslint-config	Major
@remix-run/react	Major
@remix-run/testing	Major
create-remix	Major
remix	Major
@remix-run/architect	Major
@remix-run/cloudflare	Major
@remix-run/cloudflare-pages	Major
@remix-run/cloudflare-workers	Major
@remix-run/css-bundle	Major
@remix-run/deno	Major
@remix-run/express	Major
@remix-run/node	Major
@remix-run/serve	Major
@remix-run/server-runtime	Major

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[brophdawg11]

In order to support optional entry files and npx remix reveal - we had some logic in @remix-run/dev that detects the react version and uses/outputs react 17/18-compatible versions of entry.server/entry.client. I removed all of that in 399f697 now that everything is react 18 + streaming.

[github-actions]

🤖 Hello there,

We just published version v0.0.0-nightly-96b05af-20230816 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!