feat: batch file remove actions

[PeterCardenas]

PR Description

closes #4581

when pressing the remove keymap for files, we now group them up by the action we will perform on them, and then execute each action in bulk for all the files. This is a much faster approach than executing for each file.

some notes:

• was initially fully generated by ai, i fixed it up a decent amount but the logic still seems a bit wonky, will review more once i get a chance
• the discard unstaged files logic can be a separate change if need be, ai went ahead and did both to begin with so figured i'd go with it
• trusting that existing integration tests and unit tests are good enough since this is not new behavior, but open to adding more

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