🌱 ClusterClass: make patch selector validation more robust

[sbueringer]

Signed-off-by: Stefan Büringer [email protected]

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 #7213

[fabriziopandini]

Nice one!
/lgtm

@killianmuldoon PTAL

[vincepri]

/approve

[k8s-ci-robot]

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[sbueringer]

I would propose to cherry-pick this as it fixes the current validation in the sense of capturing more error cases.

This can prevent in-correct ClusterClasses so it would be good to get this out as early as possible

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #7286

In response to this:

I would propose to cherry-pick this as it fixes the current validation in the sense of capturing more error cases.

This can prevent in-correct ClusterClasses so it would be good to get this out as early as possible

/cherry-pick release-1.2

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