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Tamir Duberstein 8aea62b2d8 Harden core test fixture startup assertions (#41194)
## Why

Test fixture setup can take more than five seconds on loaded CI workers, and
failures returned from setup can be obscured when downstream mocks verify their
expectations during teardown.

## What changed

- Add a shared `expect_startup` helper with a 30-second timeout that panics on
  either timeout or setup failure before mock teardown runs.
- Use the helper for remote-environment and unified-exec fixture setup, and
  allow the same startup window for the initial exec-server requests.

## Testing

Add paused-time tests covering successful startup after five seconds, timeout
reporting, and propagation of setup errors in the presence of unmet mocks.

GitOrigin-RevId: 39db69bde2983acd023a1911a6fad106674e169a
2026-08-27 19:58:09 +00:00
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