Branch/co-authors in commit (#24768)

- **branch selector in commit box**
- **TEMP**
- **Add co-authors toggle button**

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/git_ui/Cargo.toml

@@ -14,15 +14,16 @@ path = "src/git_ui.rs"
 
 [dependencies]
 anyhow.workspace = true
+buffer_diff.workspace = true
 collections.workspace = true
 db.workspace = true
-buffer_diff.workspace = true
 editor.workspace = true
 feature_flags.workspace = true
 futures.workspace = true
 fuzzy.workspace = true
 git.workspace = true
 gpui.workspace = true
+itertools.workspace = true
 language.workspace = true
 menu.workspace = true
 multi_buffer.workspace = true
@@ -37,7 +38,6 @@ serde_json.workspace = true
 settings.workspace = true
 theme.workspace = true
 time.workspace = true
-time_format.workspace = true
 ui.workspace = true
 util.workspace = true
 workspace.workspace = true