Warn on client source maps in RSC Framework Mode

[markdalgleish]

This matches the behaviour of our existing Vite plugin.

[changeset-bot]

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Latest commit: 7a00c45

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[github-actions]

🤖 Hello there,

We just published version 7.9.0-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 7.9.0 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!