[web] Update loading spinner in IDE for BS5 (#21970)

* Update `LoadingPane` with `LoadingSpinner`

* Remove unused file no-open-doc-pane.tsx

* Remove translation `open_a_file_on_the_left`

GitOrigin-RevId: 9045443de6aaf19b1d4bf82cd2be3ba91ee53bf1

services/web/frontend/js/features/ide-react/components/editor/loading-pane.tsx

@@ -1,15 +1,10 @@
 import { FC } from 'react'
-import { useTranslation } from 'react-i18next'
+import LoadingSpinner from '@/shared/components/loading-spinner'
 
 export const LoadingPane: FC = () => {
-  const { t } = useTranslation()
-
   return (
     <div className="loading-panel">
-      <span>
-        <i className="fa fa-spin fa-refresh" />
-        &nbsp;&nbsp;{t('loading')}…
-      </span>
+      <LoadingSpinner />
     </div>
   )
 }

services/web/frontend/js/features/ide-react/components/editor/no-open-doc-pane.tsx

@@ -1,14 +0,0 @@
-import { useTranslation } from 'react-i18next'
-
-export default function NoOpenDocPane() {
-  const { t } = useTranslation()
-
-  return (
-    <div className="loading-panel">
-      <span>
-        <i className="fa fa-arrow-left" />
-        &nbsp;&nbsp;{t('open_a_file_on_the_left')}
-      </span>
-    </div>
-  )
-}