Use dorny/paths-filter instead of native path filters for our CI

[nilsreichardt]

Because merge_groups does not support paths, we try to use the dorny/paths-filter action (workaround from community/community#45899).

We define in the changes check when changeFound should be true. All other checks should wait until path-filter is finished (needs: changes). When other checks are executed, they need to check if changeFound is true. If yes, execute the check, if no, skip.

With this workaround for the merge_groups, can we also remove our workaround for required checks that executed based on a path (fallback CI are the recommend workaround from github/docs@4364076)

[github-actions]

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