git_ui: Remove duplicated/unused tooltips (#38439)

Release Notes:

- N/A

crates/git_ui/src/commit_modal.rs

@@ -368,10 +368,6 @@ impl CommitModal {
             .icon_color(Color::Placeholder)
             .color(Color::Muted)
             .icon_position(IconPosition::Start)
-            .tooltip(Tooltip::for_action_title(
-                "Switch Branch",
-                &zed_actions::git::Branch,
-            ))
             .on_click(cx.listener(|_, _, window, cx| {
                 window.dispatch_action(zed_actions::git::Branch.boxed_clone(), cx);
             }))

crates/git_ui/src/git_panel.rs

@@ -4575,10 +4575,6 @@ impl RenderOnce for PanelRepoFooter {
             .size(ButtonSize::None)
             .label_size(LabelSize::Small)
             .truncate(true)
-            .tooltip(Tooltip::for_action_title(
-                "Switch Branch",
-                &zed_actions::git::Switch,
-            ))
             .on_click(|_, window, cx| {
                 window.dispatch_action(zed_actions::git::Switch.boxed_clone(), cx);
             });