[WIP] test/e2e: add optional Azure Linux 4 cluster e2e test

[mboersma]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Adds a new [OPTIONAL] e2e Context that builds a 3+2 HA cluster from the experimental capi-azurelinux-4-gen2 shared community gallery image, mirroring the existing Azure Linux 3 spec.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

See also kubernetes-sigs/image-builder#2014

The second commit is a temporary PContext skip of the other [OPTIONAL] specs so the e2e-optional presubmit exercises only the new AZL4 spec from this draft PR. It will be dropped before merge.

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

test/e2e: add optional Azure Linux 4 cluster e2e test

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.84%. Comparing base (2ea3260) to head (e4868e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6312   +/-   ##
=======================================
  Coverage   43.84%   43.84%           
=======================================
  Files         289      289           
  Lines       25346    25346           
=======================================
  Hits        11114    11114           
  Misses      13458    13458           
  Partials      774      774           

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[mboersma]

/test pull-cluster-api-provider-azure-e2e-optional

[mboersma]

/test pull-cluster-api-provider-azure-e2e-optional

(Failure was #5690)

[k8s-ci-robot]

@mboersma: 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-api-provider-azure-e2e-optional	e4868e7	link	false	/test pull-cluster-api-provider-azure-e2e-optional

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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