Add Code Actions to the Toolbar (#31236)

Closes issue #31120.


https://github.com/user-attachments/assets/a4b3c86d-7358-49ac-b8d9-e9af50daf671

Release Notes:

- Added a code actions icon to the toolbar. This icon can be disabled by
setting `toolbar.code_actions` to `false`.

crates/debugger_ui/src/new_session_modal.rs

@@ -1123,7 +1123,7 @@ impl PickerDelegate for DebugScenarioDelegate {
         let task_kind = &self.candidates[hit.candidate_id].0;
 
         let icon = match task_kind {
-            Some(TaskSourceKind::Lsp(..)) => Some(Icon::new(IconName::Bolt)),
+            Some(TaskSourceKind::Lsp(..)) => Some(Icon::new(IconName::BoltFilled)),
             Some(TaskSourceKind::UserInput) => Some(Icon::new(IconName::Terminal)),
             Some(TaskSourceKind::AbsPath { .. }) => Some(Icon::new(IconName::Settings)),
             Some(TaskSourceKind::Worktree { .. }) => Some(Icon::new(IconName::FileTree)),