Remove obsolete ignored tests (#34558)

## What changed

Remove ignored tests for cloud-task composer rendering, delegated approval
forwarding, and unified-exec session pruning, along with their unused imports.

GitOrigin-RevId: 66ae0d3b672f6471a52ba0479bbd8119e12182f1

codex-rs/cloud-tasks/src/lib.rs

@@ -2144,14 +2144,7 @@ mod tests {
     use codex_cloud_tasks_client::TaskStatus;
     use codex_cloud_tasks_client::TaskSummary;
     use codex_cloud_tasks_mock_client::MockClient;
-    use codex_tui::ComposerAction;
-    use codex_tui::ComposerInput;
-    use crossterm::event::KeyCode;
-    use crossterm::event::KeyEvent;
-    use crossterm::event::KeyModifiers;
     use pretty_assertions::assert_eq;
-    use ratatui::buffer::Buffer;
-    use ratatui::layout::Rect;
 
     struct StubGitInfo {
         default_branch: Option<String>,
@@ -2377,33 +2370,4 @@ mod tests {
         assert_eq!(url.0, "task_i_123456");
         assert!(parse_task_id("   ").is_err());
     }
-
-    #[test]
-    #[ignore = "very slow"]
-    fn composer_input_renders_typed_characters() {
-        let mut composer = ComposerInput::new();
-        let key = KeyEvent::new(KeyCode::Char('a'), KeyModifiers::NONE);
-        match composer.input(key) {
-            ComposerAction::Submitted(_) => panic!("unexpected submission"),
-            ComposerAction::None => {}
-        }
-
-        let area = Rect::new(0, 0, 20, 5);
-        let mut buf = Buffer::empty(area);
-        composer.render_ref(area, &mut buf);
-
-        let found = buf.content().iter().any(|cell| cell.symbol() == "a");
-        assert!(found, "typed character was not rendered: {buf:?}");
-
-        composer.set_hint_items(vec![("⌃O", "env"), ("⌃C", "quit")]);
-        composer.render_ref(area, &mut buf);
-        let footer = buf
-            .content()
-            .iter()
-            .skip((area.width as usize) * (area.height as usize - 1))
-            .map(ratatui::buffer::Cell::symbol)
-            .collect::<Vec<_>>()
-            .join("");
-        assert!(footer.contains("⌃O env"));
-    }
 }