fix(remix-dev): fix FutureConfig type

[brophdawg11]

We added a fix in #7261 to disallow unknown/removed future flags but it turns out that fix only worked when FutureConfig was empty - which it was at that time since we were preparing to release v2. Now that we added the first. v3 future flag we found out this isn't the right approach and need to use a conditional type instead.

https://www.typescriptlang.org/play?#code/JYOwLgpgTgZghgYwgAgGIFczqhAwgexBmAHNkBvAKAEgA3AZgH0o4ATVCOLHALmQCN8+ADacQlAL6VKoSLEQoAggAdlBIqQqVkO5DEzYIAfj4BtANYQAnvhhoDOdcRIBdZBAAekEKwDOyUxAIWmg3IwoLaz5fMChQVz4gkKgJZD4ABTgoMGA4YQAeDG48QmcAPklpUTBkBFLNAF4tan1ivipqOiYWdk425Fj0CAAaGjoAJkYAdzAACwgEcz5BkZoJUdTfLmBfYgh-FTV6kmkZcGh4JHtip1JxrSkzuUulVVuSe6pdPQdjM0sbHYioZ3m5PN4-AEkqFkOFyJErNFYvEXIlgtBUhksjk8oVfu8Ko9qrVjvcmh1WoZ2mMGMw2BwuFSBlAhqNOrRJjN5otlizVtR1pJkFscrtgPtkId3uNKEA

[changeset-bot]

🦋 Changeset detected

Latest commit: 9100b63

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

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[github-actions]

🤖 Hello there,

We just published version 2.3.0-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 2.3.0 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!