Improve editor::CopyAndTrim action's discoverability (#27484)

Follow-up of https://github.com/zed-industries/zed/pull/27206

Add it to the editor context menu and Zed's app menu near the `Copy`
action.

Release Notes:

- N/A

crates/zed/src/zed/app_menus.rs

@@ -95,6 +95,7 @@ pub fn app_menus() -> Vec<Menu> {
                 MenuItem::separator(),
                 MenuItem::os_action("Cut", editor::actions::Cut, OsAction::Cut),
                 MenuItem::os_action("Copy", editor::actions::Copy, OsAction::Copy),
+                MenuItem::action("Copy and trim", editor::actions::CopyAndTrim),
                 MenuItem::os_action("Paste", editor::actions::Paste, OsAction::Paste),
                 MenuItem::separator(),
                 MenuItem::action("Find", search::buffer_search::Deploy::find()),