Added ObjectMeta to KubeadmConfigTemplateResource, KubeadmControlPlaneTemplateResource

[killianmuldoon]

Following on from #5240 we should probably add ObjectMeta to all of our *TemplateResource types as we did for the Docker infrastructure templates in #5441

There's no clear use case for adding this meta to KubeadmConfigTemplateResource, KubeadmControlPlaneTemplateResource, but there seems to be consensus that this field should be added for consistency.

Related: #5393, #5371

/kind cleanup
/area bootstrap
/area control-plane

[sbueringer]

Should we then re-add it also to the documentation as part of this issue?
(has been dropped here if I'm not mixing up things)

[fabriziopandini]

/triage accepted

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/lifecycle stale

[fabriziopandini]

/kind api-change
/lifecycle frozen

[sbueringer]

Done in #8180

/close

[k8s-ci-robot]

@sbueringer: Closing this issue.

In response to this:

Done in #8180

/close

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