bigtable: TestIntegration_AdminBackup failed

[flaky-bot]

Note: #11414 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: 394ef95
buildURL: Build Status, Sponge
status: failed

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (394ef95), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).

[bhshkh]

Error from logs:

=== RUN   TestIntegration_AdminBackup
    integration_test.go:4414: foundBackups: map[mybackup--20250530-83162397199934-0002:true mybackup--20250530-83162397199934-0003:true], wantBackups: map[mybackup--20250530-83162397199934-0001:{HotToStandardTime:<nil> BackupType:1} mybackup--20250530-83162397199934-0002:{HotToStandardTime:2025-06-01 23:06:05 +0000 UTC BackupType:2} mybackup--20250530-83162397199934-0003:{HotToStandardTime:<nil> BackupType:2}]
--- FAIL: TestIntegration_AdminBackup (179.51s)

[bhshkh]

Reducing the priority to P2. This is an issue with the test and not the library