[WIP] Convert managedclusters service to SDKv2

[mboersma]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Converts the managedclusters service to use azure-sdk-for-go v2.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

This is a draft because the agentpools service still needs to be converted, so tests are failing.

• cherry-pick candidate

TODOs:

• convert agentpools service to SDKv2
• integrate auth solution from Require AzureClusterIdentity for auth #3793
• squashed commits
• includes documentation
• adds unit tests

Release note:

Convert managedclusters service to SDKv2

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

PR needs rebase.

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[mboersma]

/close

This was opened mainly to demonstrate progress, but I'm actually breaking things up into more digestible PRs and starting with the agentpools service.

[k8s-ci-robot]

@mboersma: Closed this PR.

In response to this:

/close

This was opened mainly to demonstrate progress, but I'm actually breaking things up into more digestible PRs and starting with the agentpools service.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.