chore: Reduce code duplication for metadata metric families

[mrueg]

What this PR does / why we need it:
There are common metrics shared among all resources for creation, deletion, labels and annotations. We can deduplicate code this way and currently I implemented it for pods (I will apply it to other resources as well).

The downside with the current approach is, that we can flip stability only on and off for all of them, which I think is fine because of the common nature of these metrics.

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
None
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 #

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