[cluster-autoscaler-release-1.29] 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`.

[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	b82f83f	link	false	/test pull-cluster-autoscaler-e2e-azure

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[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

This pull-request has been approved by: Bryce-Soghigian, k8s-infra-cherrypick-robot

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