git: Pick which remote to fetch (#26897)

I don't want to fetch `--all` branch, we should can picker which remote
to fetch.

Release Notes:

- Added the `git::FetchFrom` action to fetch from a single remote.

---------

Co-authored-by: Cole Miller <cole@zed.dev>

crates/git/src/git.rs

@@ -49,6 +49,7 @@ actions!(
         ForcePush,
         Pull,
         Fetch,
+        FetchFrom,
         Commit,
         Amend,
         Cancel,