add migration flag in Azure volume CSI migration logic

[andyzhangx]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR add migration flag(csi-migration: "true") in Azure volume CSI migration logic, and we could disable CreateVolume for csi migrated PV requests in CSI driver in the future, related CSI driver PR: kubernetes-sigs/azuredisk-csi-driver#944

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

This PR add migration flag(`csi-migration: "true"`) in Azure volume CSI migration logic

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

This PR add migration flag(`csi-migration: "true"`) in Azure volume CSI migration logic

/kind bug
/assign @Jiawei0227 @msau42
/priority important-soon
/sig cloud-provider
/area provider/azure
/triage accepted

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: andyzhangx
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[Jiawei0227]

See comments here: #98243 (comment)

Trying to understand why this PR is needed.

[andyzhangx]

/reopen

[k8s-ci-robot]

@andyzhangx: Failed to re-open PR: state cannot be changed. The csi-migration-flag branch was force-pushed or recreated.

In response to this:

/reopen

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