Fix the linux keymap (#9829)

Earlier versions where a simple find-replace of `cmd` => `ctrl`. In this
PR, I've gone over every keybinding individually and checked them.

Release Notes:

- Removed the `ShowContextMenu` action, it's only usage was in the
collab panel and it's been rebound to `SecondaryConfirm`

crates/menu/src/menu.rs

@@ -19,7 +19,6 @@ actions!(
         SelectNext,
         SelectFirst,
         SelectLast,
-        ShowContextMenu,
         UseSelectedQuery,
     ]
 );