[WIP] releng: Remove configs for k8s-beta jobs / add k8s-stable4 variants

[justaugustus]

(Continuation of #26015.)

For years, we've had issues with the k8s-beta generic version
marker.

There are a few scenarios...

During the dev cycle:

• beta should not exist, but actually points to the previous release

After a beta release:

• beta should exist, but:
  1. no one really updated this manually
  2. the branch cuts and job creation happens at the RC stage

After an RC release (branch cut):

• beta should have already existed
• beta represents the RC version after branch job creation

After an official release:

• beta should not exist, but actually points to the previous release

None of these scenarios are acceptable, so it's time to remove this
marker. Generated jobs that reference beta in their name have
already been using version-specific markers for multiple releases, so
this has minimal impact.

Here we instead add a k8s-stable4 marker, to provide a version
marker for a release branch that is in maintenance mode/soon-to-be
EOL-ed.

Adding a marker at the end of the set means we no longer have to
consider moving the k8s-beta marker during a release cycle.

Signed-off-by: Stephen Augustus [email protected]

/assign @puerco @Verolop @palnabarun
cc: @kubernetes/release-engineering

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[justaugustus]

/hold this still needs job regeneration and we should land the release branch jobs first

[k8s-ci-robot]

@justaugustus: 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-test-infra-unit-test	6be11fb	link	true	/test pull-test-infra-unit-test

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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[k8s-ci-robot]

@justaugustus: PR needs rebase.

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[justaugustus]

We should resurrect this at some point, but for now:
/close

[k8s-ci-robot]

@justaugustus: Closed this PR.

In response to this:

We should resurrect this at some point, but for now:
/close

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