[release-1.31] cleanup: refine file watcher logging

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #2631

/assign andyzhangx

none

[k8s-ci-robot]

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[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-azuredisk-csi-driver-external-e2e-single-az	1b887f32030660b55aa399e66594a9fa73d07a7d	link	true	/test pull-azuredisk-csi-driver-external-e2e-single-az
pull-azuredisk-csi-driver-e2e-capz-windows-2022-hostprocess	1b887f32030660b55aa399e66594a9fa73d07a7d	link	true	/test pull-azuredisk-csi-driver-e2e-capz-windows-2022-hostprocess

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[andyzhangx]

/retest