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

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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.

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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