Use retry wrapper to ensure-azcli.sh and run ci-build-azure-ccm::cleanup only if present

[jrvaldes]

Azure CLI installation reliability:

• Added a new function ensure_azcli_with_retry() that attempts to install Azure CLI up to five times with exponential backoff, logging each attempt and showing logs from failed attempts if installation does not succeed.
• Updated the set_azure_envs() function to use ensure_azcli_with_retry() instead of directly sourcing ensure-azcli.sh, exiting with an error if installation fails.

Cleanup logic:

• Improved robustness of the cleanup process by checking if capz::ci-build-azure-ccm::cleanup is defined before calling it, and logging a warning if not found.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jrvaldes
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[k8s-ci-robot]

Hi @jrvaldes. Thanks for your PR.

I'm waiting for a github.com 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[aravindhp]

/ok-to-test

[jrvaldes]

Azure CLI install step passed, Helm is now failed 😄

https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_windows-testing/522/pull-e2e-capz-windows-2025-extension/1983641196173463552#1:build-log.txt%3A141

[jrvaldes]

pull-e2e-capz-windows-2025-extension is progressing

https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_windows-testing/522/pull-e2e-capz-windows-2025-extension/1983644654431637504#1:build-log.txt%3A197

[jrvaldes]

/test pull-e2e-capz-windows-2022-extension