Make CSI mock driver log parse more flexible

[Jiawei0227]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
This PR makes the mock CSI driver log parse function more flexible to embrace the future change where we use klog instead of fmt.print for mock csi driver logging.

Which issue(s) this PR fixes:

Fixes

Special notes for your reviewer:
This is for #93358. It would be good if we can get an idea of the timestamps of all the events happened in mock CSI driver. But in order to do that, we need to flexible the tests first.

This is a prerequisite for this PR: kubernetes-csi/csi-test#279

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

/cc @msau42
/cc @pohly
/cc @gnufied
/sig storage

[k8s-ci-robot]

Hi @Jiawei0227. Thanks for your PR.

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[pohly]

/ok-to-test

[oomichi]

/lgtm

[Jiawei0227]

/retest

[pohly]

/lgtm
/approve

[msau42]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jiawei0227, msau42, pohly

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• test/e2e/storage/OWNERS [msau42]

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