[release-1.29] chore: refine sastoken cache

[andyzhangx]

This is an automated cherry-pick of #1770

/assign andyzhangx

none

[k8s-ci-robot]

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[andyzhangx]

/retest

[andyzhangx]

/retest

[k8s-ci-robot]

@andyzhangx: The following test 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-azurefile-csi-driver-e2e-capz-windows-2022-hostprocess	f52af77	link	true	/test pull-azurefile-csi-driver-e2e-capz-windows-2022-hostprocess

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