tests: TestProxyAppliedOnExistingWorkload failed

Note: #668 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky. ---- commit: f10fdc9034258323290ceba4dea713cb603b45bb buildURL: https://github.com/GoogleCloudPlatform/cloud-sql-proxy-operator/actions/runs/20017527884 status: failed