[release-1.29] cleanup: remove unused livenessProbe in registrar

[andyzhangx]

What type of PR is this? /kind cleanup

What this PR does / why we need it: cleanup: remove unused livenessProbe in registrar cherrypick of https://github.com/kubernetes-sigs/azuredisk-csi-driver/pull/2647

Which issue(s) this PR fixes:

Fixes #

Requirements:

• [ ] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/azuredisk-csi-driver/blob/release-1.29/OWNERS)~~ [andyzhangx] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[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-azuredisk-csi-driver-external-e2e-single-az	ed0542870f1a1dbdc3ac686d8dae81231342ab18	link	true	/test pull-azuredisk-csi-driver-external-e2e-single-az

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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