cleanup: remove csi connector

[mowangdk]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Cleanup csi connector

Which issue(s) this PR fixes:

Fixes #1432

Special notes for your reviewer:

Does this PR introduce a user-facing change?

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

[k8s-ci-robot]

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[k8s-ci-robot]

@mowangdk: 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-alibaba-cloud-csi-driver-verify-vet	9bfc5ce	link	true	/test pull-alibaba-cloud-csi-driver-verify-vet
pull-alibaba-cloud-csi-driver-verify-unit	9bfc5ce	link	true	/test pull-alibaba-cloud-csi-driver-verify-unit

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[huww98]

Should we enable feature gate AlinasMountProxy by default first, then remove csi-connector in the following version?

[mowangdk]

Should we enable feature gate AlinasMountProxy by default first, then remove csi-connector in the following version?

yeah, you are right, i didn't notice we got this featuregate

[mowangdk]

/hold

[k8s-ci-robot]

PR needs rebase.

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