[Azure VMs pool] Introducing agentpool client

[wenxuan0923]

What type of PR is this?

We will introduce a new vmType: vms to support the autoscaling for single instance vm pool. This new agentpool type will rely on AKS rp for scaling up and down instead of CRP call, which requires the agentpool client, cluster name and cluster resource group info.

In this PR, I'm adding the required info to the config and adding agentpool client into azClient. So far, the construction error is ignored so that no existing behavior will be impacted by this change.

See the PR targeting the 1.29 release: #6685

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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

[k8s-ci-robot]

Hi @wenxuan0923. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: wenxuan0923

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