Watcher is sensitive during git transaction

- My git workflow is based on https://www.git-town.com/
- When I do `git town sync` a couple of stashes and unstashes are done (similar to what `pre-commit` does on unclean repos)
- ... you guessed it! `skaffold dev` is sensitive to such merely chore filesystem changes.
- This eventually gets annoying.

I propose to pause skaffold watcher during a git transaction.

See discussion on `direnv` for similar issue https://github.com/direnv/direnv/issues/653.

Contrary to `direnv`, can we make up a use case where one actually _would_ have a complete rebuild in the midst of a git rebase merge conflict?