chore: stabilize flaky ci tests

[birkskyum]

During CI Vite warns about:

[vitest] Vite unexpectedly reloaded a test. This may cause tests to fail, lead to flaky behaviour or duplicated test runs.
For a stable experience, please add mentioned dependencies to your config's optimizeDeps.include field manually.

So this adds the testing library to teh optimizeDeps, so vite deosn't warn about flakiness.

This also adds a small timeout on the hydration tests which is flaky.

These issues are why teh ci currently fails in e.g.

• feat: server function inspector #2049

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commit: fe88597