chore: check in types

[dummdidumm]

To ensure that changes to code/types doesn't result in unwanted changes in type generation, or that bumps to dts-buddy don't cause unwanted regressions, we're checking in the generated types. Types should be committed as-is (don't format it with prettier!). CI is enhanced to check that git sees no changed files after generating the types, which would mean types have changed.

This intentionally goes against master. That way we can see which changes SvelteKit version 2 introduces and review them carefully.

Closes #11200

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