Fix deleting while exporting

[Vicente-Cheng]

Which issue(s) this PR fixes:

Issue #

What this PR does / why we need it:

• fix the timing issue for deleting while exporting failure
• fix the skip mechanism that did not work correctly on backup tests
• fix some backup CRDs that were not cleaned up

Special notes for your reviewer:

Additional documentation or context

[Vicente-Cheng]

Test result:

2026-07-11 04:50:16.690101 [PID:25] [5] [ID:5] EXECUTING Tests.Regression.Vm.Test Vm Operations
2026-07-11 04:50:16.691366 [PID:27] [6] [ID:6] EXECUTING Tests.Regression.Vm.Test Vm Volumes
2026-07-11 04:50:16.691536 [PID:26] [3] [ID:3] EXECUTING Tests.Regression.Vm.Test Vm
2026-07-11 04:50:16.695741 [PID:37] [0] [ID:0] EXECUTING Tests.Regression.Backup.Test Vm Backup
2026-07-11 04:50:16.698841 [PID:40] [2] [ID:2] EXECUTING Tests.Regression.Image.Test Image Negative
2026-07-11 04:50:16.699341 [PID:41] [7] [ID:7] EXECUTING Tests.Regression.Volume.Test Volume
2026-07-11 04:50:16.702972 [PID:49] [4] [ID:4] EXECUTING Tests.Regression.Vm.Test Vm Negative
2026-07-11 04:50:16.703731 [PID:50] [1] [ID:1] EXECUTING Tests.Regression.Image.Test Image
2026-07-11 04:50:17.603011 [PID:37] [0] [ID:0] PASSED Tests.Regression.Backup.Test Vm Backup in 0.9 seconds
2026-07-11 04:50:17.609974 [PID:57] [0] [ID:8] EXECUTING Tests.Regression.Volume.Test Volume Negative
...
53 tests, 46 passed, 0 failed, 7 skipped.
===================================================

You can see the backup completed very fast and was marked as skipped.
(Previously, we needed to wait for a 10-minute timeout)

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