vim lifecycle (#7647)

Release Notes:

- Fixed :0 and :% in vim mode
([#4303](https://github.com/zed-industries/zed/issues/4303)).
- Improved keymap loading to not load vim key bindings unless vim is
enabled

**or**

- N/A

crates/vim/src/test/vim_test_context.rs

@@ -49,7 +49,9 @@ impl VimTestContext {
                 store.update_user_settings::<VimModeSetting>(cx, |s| *s = Some(enabled));
             });
             settings::KeymapFile::load_asset("keymaps/default.json", cx).unwrap();
-            settings::KeymapFile::load_asset("keymaps/vim.json", cx).unwrap();
+            if enabled {
+                settings::KeymapFile::load_asset("keymaps/vim.json", cx).unwrap();
+            }
         });
 
         // Setup search toolbars and keypress hook