fix uncertain cache

[huww98]

What type of PR is this?
/kind bug

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/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

fix wrong error is used when checking final error.

map is not safe for concurrent read/write from multiple worker. Also fixed that.

Added related tests.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fixed uncertain state

[k8s-ci-robot]

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[k8s-ci-robot]

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[huww98]

We don't need to add them manually, as informer will read them from kubeClient. ctrl.init(ctx) will wait for cache sync.

[huww98]

Already done by caller, no need to do it again.

[huww98]

After a PVC is marked as completed, it is re-queued. In the next cycle, we may still read out the PVC with InProgress status. Then we should have conflict when trying to mark it InProgress again. However, fake client does not supports resourceVersion. So when we pass an empty cache to it, it returns the latest PVC, with ModifyVolumeStatus == nil, which will make markControllerModifyVolumeCompleted panic.

Should we somehow make metadata.generation work for PVC? So that we can cache the already synced generation+VACName, and will know the PVC in the cache is outdated, and just skip that cycle.