fix custom CA e2e waiting on stale replica set

[buraksekili]

What this PR does / why we need it:

This PR allows tests to wait for the rollout to actually finish (observed generation caught up, and all replicas updated and available) before issuing the create. Test-only change.

i observed this on cherry-pick PR

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?:
/kind flake

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

NONE

Documentation:

NONE

[kubermatic-bot]

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[buraksekili]

/cherrypick release/v1.65

[kubermatic-bot]

@buraksekili: once the present PR merges, I will cherry-pick it on top of release/v1.65 in a new PR and assign it to you.

Details

In response to this:

/cherrypick release/v1.65

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