Moved unit tests for `withTimeout` from `test/utils.test.mjs` to `test/utils-async.test.mjs`.
This prevents potential interference from `MockTimers` enabled in `test/utils.test.mjs` which could affect `setTimeout` behavior in async tests.
Increased timeout margins in `withTimeout` tests for better reliability in CI.
Co-authored-by: PR0M3TH3AN <[email protected]>