[cluster-autoscaler-release-1.30] allow customizing user agent for Azure cluster-autoscaler provider

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #7033

/assign nojnhuh

The `AZURE_CLUSTER_AUTOSCALER_USER_AGENT_SUFFIX` variable can be used to customize the user agent for the Azure provider of cluster-autoscaler. Setting this to `-my-user-agent` results in a user agent like `Go/go1.22.5 (amd64-linux) go-autorest/v14.2.1 cluster-autoscaler-my-user-agent/v1.31.0-alpha.2`.

[jackfrancis]

/retest

[nojnhuh]

@jackfrancis The release branches don't have the tests defined that the test-infra config assumes, so e2e tests here will fail until we backport them. We'll also need changes in test-infra to make sure the test cluster is using the right version of k8s. Are those changes worth making soon?

[jackfrancis]

@nojnhuh let's do that after the 1.31 release (which will include the necessary test files from main that landed in advance of the 1.31 release)

[k8s-ci-robot]

@k8s-infra-cherrypick-robot: 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-cluster-autoscaler-e2e-azure	18c9d14	link	false	/test pull-cluster-autoscaler-e2e-azure

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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[nojnhuh]

/lgtm
/assign @tallaxes

[Shubham82]

hold till CA 1.31 release

/hold

[nojnhuh]

#7056 (comment)

/hold cancel

[Bryce-Soghigian]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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