feat: add recommended app.kubernetes.io labels to control-plane Pods

[michaelbeaumont]

Pull Request

What? (description)

Closes #9450. This PR adds most of the recommended labels. These are just my own suggestions though, feel free to suggest different ones or fewer. In particular, not sure about /component vs /part-of so maybe better to leave them out? I also left out /instance, not quite sure what to set that to or how, probably something with the node name though.

Why? (reasoning)

It's useful to have a set of uniform labels across Pods when looking at metrics and logs or even kubectl output, for example.

Acceptance

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