Only add Remix packages to ssr.external in Remix repo

[markdalgleish]

As noted by the changeset, this fixes an issue where consumers who had added Remix packages to Vite's ssr.noExternal option were being overridden by the Remix Vite plugin adding Remix packages to Vite's ssr.external option.

Our use of ssr.noExternal (fixing a Vite issue within the Remix repo) was incorrectly thought to be a no-op for consumers, so instead we now detect when we're in the Remix repo before applying the fix.

[changeset-bot]

🦋 Changeset detected

Latest commit: 53fd95d

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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[brophdawg11]

👍