Is your feature request related to a problem? Please describe.
When pushing and pulling, a progress indicator shows up that lets me know that the keypress has been received and lazygit is working on it.

But there are other operations that can take a longer time, such as rebasing, or "discard all changes" when the file tree is showing.

Describe the solution you'd like
Show a progress indicator, similar to the one for push and pull.

Describe alternatives you've considered
I wonder whether the indicator would be disruptive in case the operation is fast.

Additional context
Add any other context or screenshots about the feature request here.