Tool bar: Remove tool grouping for clarity (#15285)

This PR makes the spacing between items in the tool bar (quick action
bar) consistent vs grouped by type. The idea was to add clarity to the
types of tools, but we haven't built this system out enough for these
groupings to be recognizable. So for now, let's make the spacing
consistent.

Before:
![CleanShot 2024-07-26 at 11 58
22@2x](https://github.com/user-attachments/assets/9135fcce-fcf8-4bdf-a71b-6d6c7e5b3f63)


After:

![CleanShot 2024-07-26 at 11 57
02@2x](https://github.com/user-attachments/assets/0aceb981-01b6-466f-8d7e-97b564d014f9)

Release Notes:

- N/A

crates/quick_action_bar/src/quick_action_bar.rs

@@ -303,9 +303,6 @@ impl Render for QuickActionBar {
 
         h_flex()
             .id("quick action bar")
-            .gap(Spacing::XXLarge.rems(cx))
-            .child(
-                h_flex()
             .gap(Spacing::Medium.rems(cx))
             .children(self.render_repl_menu(cx))
             .children(self.render_toggle_markdown_preview(self.workspace.clone(), cx))
@@ -314,14 +311,9 @@ impl Render for QuickActionBar {
                 AssistantSettings::get_global(cx).enabled
                     && AssistantSettings::get_global(cx).button,
                 |bar| bar.child(assistant_button),
-                    ),
             )
-            .child(
-                h_flex()
-                    .gap(Spacing::Medium.rems(cx))
             .children(editor_selections_dropdown)
-                    .child(editor_settings_dropdown),
-            )
+            .child(editor_settings_dropdown)
             .when_some(self.repl_menu.as_ref(), |el, repl_menu| {
                 el.child(Self::render_menu_overlay(repl_menu))
             })