Bootstrap 3 cleanup from the IDE page - #2 (#24175)

* Remove skipLoadingStyleSheet

* Remove unused bootstrap-5 assignment from the Account settings page since it's archived

* Remove bsVersionIcon

* Remove bsVersion, bootstrapVersion and isBootstrap5 from elements on the IDE page

* Remove BS3Dropdown from the context menu

* Cleanup Bootstrap 3 related comment and type

GitOrigin-RevId: a67244eb78943ee84cc5f89bae164c0361e8fc13

services/web/frontend/js/features/source-editor/extensions/search.ts

@@ -303,7 +303,7 @@ const searchFormTheme = EditorView.theme({
       padding: 'var(--spacing-03) var(--spacing-05)',
     },
   },
-  '&.bootstrap-5 .ol-cm-search-form': {
+  '&.ol-cm-search-form': {
     '--ol-cm-search-form-gap': 'var(--spacing-05)',
     '--ol-cm-search-form-button-margin': 'var(--spacing-02)',
     '--input-border': 'var(--border-primary)',