chore: Remove RouterLink from globals, its replaced by XAction

[johncowen]

Replaces all remaining instances of RouterLink with XAction, then removes RouterLink from eslint globals.

Note: RouterLink is still available for use, its just harder to use.

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Replaces all remaining instances of KButton with XAction. XAction uses KButton under-the-hood

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Why:

XAction is one single component for "let the user click this to perform an action". Engineers don't need to think about whether it should be a button, an anchor, a RouterLink, a KButton or something else and occasionally make the wrong choice. Just use XAction and all will be good.

XAction also comes with extra functionality to easily be able to update URL query strings with boolean ?active to mean active=true.

https://github.com/kumahq/kuma-gui/pull/2273

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Lastly I've been waiting for a good time to do this (i.e. I don't have another bunch of potentially conflicting PRs up), and now felt like a good time to do it.

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