test(core): Improve offline transport test performance #13460
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extracted from #13439
based on #13458
This PR significantly improves the performance of our offline transport unit tests. These tests were the bottleneck of our unit test performance previously, as they included actual multi-second timeouts. This PR converts the test to use vitest's fake timers which as far as I can tell, still tests the offline transport correctly but heavily increases performance.
Locally, I this brought down the runtime of the entire test suite from ~20s to ~6s.