git: First stab at adding Linux and Vim keybindings (#23738)

Release Notes:

- N/A

crates/vim/src/test/vim_test_context.rs

@@ -22,6 +22,7 @@ impl VimTestContext {
             release_channel::init(SemanticVersion::default(), cx);
             command_palette::init(cx);
             project_panel::init(Assets, cx);
+            git_ui::init(cx);
             crate::init(cx);
             search::init(cx);
         });