bump IPv6DualStack to beta (early merge from 1.21)

[danwinship]

Pull in the IPv6DualStack alpha->beta migration now, so we can test dual stack in master without needing to override feature gates.

I skimmed for other post-1.20 dual-stack related commits and found:

• improved e2e testing
• ipvs fixes
• cloud/Azure fixes
• fixes to error handling when the user creates invalid dual-stack services
• fixes for single-stack clusters where IPv6 is disabled in the kernel

none of which seems immediately necessary (though we may end up merging a few more bits before the eventual 1.21 rebase...)

cc @aojea

[openshift-ci-robot]

@danwinship: the contents of this pull request could be automatically validated.

The following commits are valid:

• c16c22e|UPSTREAM: 98969: ammend tests to ensure feat gate is off when expected (beta: gate is always on): the upstream PR kubernetes/kubernetes#98969 has merged
• e95d52f|UPSTREAM: 98969: upgrade IPv6DualStack feature to beta and turn on by default: the upstream PR kubernetes/kubernetes#98969 has merged

[aojea]

/retest

[danwinship]

/retest

[aojea]

/retest

[aojea]

/test e2e-gcp-upgrade
this can be a legit failure 👀

[danwinship]

e2e-gcp-upgrade is failing for everyone since Thursday

[aojea]

/retest

[aojea]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aojea, danwinship
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[aojea]

/retest

[aojea]

/retest

[aojea]

/retest

[openshift-ci]

@danwinship: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-gcp-upgrade	c16c22e	link	/test e2e-gcp-upgrade
ci/prow/e2e-aws-downgrade	c16c22e	link	/test e2e-aws-downgrade

Full PR test history. Your PR dashboard.

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[danwinship]

/assign @soltysh

this is just an early merge from 1.21 to simplify our 4.8 dual-stack testing

[soltysh]

Spoke with @danwinship on slack, this can wait roughly a week, by then we should be ready with #624.
/close

[openshift-ci-robot]

@soltysh: Closed this PR.

In response to this:

Spoke with @danwinship on slack, this can wait roughly a week, by then we should be ready with #624.
/close

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