[Feature] Add a prune checkbox to the fetch dialog and remember its state

[Autre31415]

Currently the prune option can only be set globally in the settings screen.

[love-linger]

...

1. Before 8.35, there's a Prune remote dead branches in Fetch popup
2. In 8.35, the Prune remote dead branches has been removed. [Enhancement] Optimize fetch prune behavior #590
3. In 8.37, I added a pre-repository configuration Enable --prune on fetch. [Enhancement] Optimize fetch prune behavior #590
4. In 2025.04, the Enable --prune on fetch has been moved to global git configure fetch.prune. [Feature Request] Create Merge/Pull Request from branch context menu #980

[love-linger]

I've pushed a new commit that supports configure fetch.prune for a single repository from Repository Configura window.

You can download the latest CI build from Github Action.