🐛 Defaulting webhook should check class is set in ClusterClass-based clusters

[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 #

[killianmuldoon]

Sort of amazed we didn't already have this check

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: f8ca92ae2d2d0ff857c7dc4f105ac40d830ee95f

[fabriziopandini]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini, killianmuldoon

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[sbueringer]

Sort of amazed we didn't already have this check

/lgtm /approve

We had it in validateTopology for ValidateCreate/Update. There it was run before we were validating variables, but yeah we never had it in Default and we also never added it when we moved over the variable validation.

[sbueringer]

/cherry-pick release-1.7

[sbueringer]

/cherry-pick release-1.6

[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #10673

In response to this:

/cherry-pick release-1.7

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[k8s-infra-cherrypick-robot]

@sbueringer: new pull request created: #10674

In response to this:

/cherry-pick release-1.6

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