Apply Warehouse Git subscription path filters to all CommitSelectionStrategy types

[maksimstankevic]

This was raised by @krancour: "I only just noticed this now and didn't notice in #1477 -- does this path filtering only work with the NewestFromBranch commit selection strategy? That appears to be the case and I'm now wondering why that is. (We can open a separate issue for this if we determine this was a mistake.)"

I started implementation of path filters aimed at only the NewestFromBranch CommitSelectionStrategy. Now after rethinking I believe it should not be restricted to the mentioned CommitSelectionStrategy but instead apply to all of the strategies. No matter if tag filters are used in a Git subscription - that should not prevent the option of additionally using path filters. In fact having both filtering types combined makes it more flexible in my opinion.

@krancour @hiddeco what do you think? If approved I'll take it.

[krancour]

@maksimstankevic agreed.

[maksimstankevic]

Sent #1918