🌱 [WIP] kcp: fix etcd members healthy message for v1beta2 available condition

[chrischdi]

What this PR does / why we need it:

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 #

Part of #11105

/area conditions

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[fabriziopandini]

/hold
I'm looking into KCP available, etcd learner mode and some flakes I'm observing

[sbueringer]

/close

Addressed in another PR

[k8s-ci-robot]

@sbueringer: Closed this PR.

In response to this:

/close

Addressed in another PR

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