🌱 ClusterClass: change PatchSelectorMatch fields to non-pointer

[sbueringer]

Signed-off-by: Stefan Büringer buringerst@vmware.com

What this PR does / why we need it:
This PR changes the fields of PatchSelectorMatch to non-pointer. I think it makes sense because there is no semantical difference between nil and the zero value.

Fields SHOULD be pointers if the nil and the zero values (by Go standards) have semantic differences
quote from our API conventions

It's simply easier to handle the fields if they are no pointers and as they don't have to be ...

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Follow-up to #5735 (comment)

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Test name	Commit	Details	Required	Rerun command
pull-cluster-api-apidiff-main	e019c30	link	false	/test pull-cluster-api-apidiff-main

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[sbueringer]

Diff is fine because the struct has not been released (yet)

[killianmuldoon]

/lgtm

Thanks for changing this!

[fabriziopandini]

/lgtm
given that those type are not part of a release yet

@vincepri PTAL

[vincepri]

/approve
/lgtm

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