Westphalrafael/investigate 3.0 flakes#2367
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During nightly E2E integration tests, TestRestartVM frequently flakes when restarting the VM if the zone is out of capacity (stockout), because the underlying gce-testing-internal library treats stockouts as permanent errors and aborts retries. This CL implements a local helper restartInstanceWithRetries in the test suite that performs StopInstance followed by StartInstance inside a custom retry loop, specifically retrying on ZONE_RESOURCE_POOL_EXHAUSTED and other transient capacity errors.
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