{AKS} Stabilize AKS live test scenarios

[FumingZhang]

🤖 PR Validation — ️✔️ All clear

Breaking Changes	Tests
️✔️ None	️✔️ 130/130

Related command

az aks

Description

Harden AKS live tests against the failure modes observed in CLI Runner:

• Normalize quoted-empty service principal environment values and skip credential-dependent scenarios when credentials are unavailable.
• Poll non-terminal cluster and agent-pool responses, then re-fetch exact cluster/agent-pool resources through native aks show commands before running checks.
• Retry only the known transient AKS serialization conflicts (Another operation is in progress and PutExtensionAddonHandler.PUT) with bounded exponential backoff. Other errors and expected-failure scenarios still fail immediately.
• Preserve feature-required regions for zone, Automatic SKU, Azure Container Storage, LocalDNS, and network-isolated tests instead of applying the runner-wide region override.
• Select currently supported non-LTS Kubernetes versions for LocalDNS and network-isolated live tests.
• Explicitly set the IPv4 managed outbound IP count in the dual-stack scenario.
• Skip obsolete Basic Load Balancer scenarios because Basic LB retired on September 30, 2025.

Current dev also contains the newer AKS SDK/API version that resolves the maintenance and artifact-streaming payload mismatches seen in the original run. Azure Monitor LRO poller leaks are handled separately by #33734.

This PR changes test infrastructure only; customer-facing command behavior is unchanged.

Testing Guide

python -m pytest -q \
  src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_provisioning_retry.py \
  src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_custom_preparers.py

Result: 27 passed, 7 subtests passed.

Focused scenario replay validation:

2 passed, 6 skipped

The skips are the intentionally live-only or retired scenarios. All changed files also pass python -m py_compile and git diff --check.

History Notes

None (test infrastructure only).

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[Copilot]

Pull request overview

This PR strengthens the AKS command module’s live-test scaffolding to reduce flaky failures in CI runners by normalizing missing credential inputs, adding bounded retries for known transient AKS conflicts, and ensuring assertions run against “settled” AKS resources re-fetched via native aks show/aks nodepool show.

Changes:

• Add normalization for optional live-test environment settings (including quoted-empty placeholders) and ensure SP-dependent scenarios are skipped when credentials are unavailable.
• Enhance the live-only ScenarioTest.cmd() adapter to retry known transient AKS operation conflicts and, after polling to Succeeded, re-fetch the exact cluster/agentpool resource for stable checks/return values.
• Add/extend unit tests covering the new normalization behavior, cmd dispatch behavior when checks=None, transient-conflict retry behavior, and settled-result re-fetch behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_custom_preparers.py	Adds unit tests validating normalization of optional settings and SP preparer skipping when credentials are quoted-empty.
src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_provisioning_retry.py	Expands unit coverage for live retry dispatch, settled-result refetching, and transient conflict retry logic.
src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_commands.py	Updates the live-only cmd adapter to include transient conflict retries and to re-fetch settled AKS resources after polling.
src/azure-cli/azure/cli/command_modules/acs/tests/latest/custom_preparers.py	Introduces _normalize_optional_live_test_setting and applies it to SP preparer settings to avoid false “present” credentials.

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