XWIKI-22877: UIX in the information tab cannot load JavaScript and CSS resources (#3901)

* Send skin extensions in the X-XWIKI-HTML-HEAD header.
* Remove the duplicate loading of skin extensions from docextra.vm

(cherry picked from commit 62bd4d95)

xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-resources/src/main/resources/flamingo/docextra.vm

@@ -60,9 +60,6 @@
     #set ($discard = $docextras.add(['History', 'history', $services.localization.render('docextra.history'), -1, 'historyinline.vm', $services.localization.render('core.shortcuts.view.history')]))
   #end
   #if ($showinformation)
-    $xwiki.jsfx.use('js/xwiki/viewers/information.js', {'forceSkinAction': true, 'language': ${xcontext.locale}})
-    $xwiki.ssfx.use('js/xwiki/viewers/information.css', true)
-    $xwiki.jsfx.use('uicomponents/edit/editableProperty.js', {'forceSkinAction': true, 'language': $xcontext.locale})
     #set ($discard = $docextras.add(['Information', 'information', $services.localization.render('docextra.information'), -1, 'informationinline.vm', $services.localization.render('core.shortcuts.view.information')]))
   #end
 #end

xwiki-platform-core/xwiki-platform-web/xwiki-platform-web-templates/src/main/resources/templates/informationinline.vm

@@ -18,6 +18,7 @@
 ## 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 ## ---------------------------------------------------------------------------
 #template('display_macros.vm')
+#initRequiredSkinExtensions()
 #macro(docTranslationLink $locale $action $fragment)
   #set ($localeName = $locale.getDisplayName($xcontext.locale))
   #if ("$!localeName" == '')
@@ -267,3 +268,5 @@ $xwiki.jsfx.use('uicomponents/edit/editableProperty.js', {'forceSkinAction': tru
     <div class="clearfloats">&nbsp;</div>
   </div>## _information
 </div>## informationcontent
+#getRequiredSkinExtensions($requiredSkinExtensions)
+#set ($discard = $response.setHeader('X-XWIKI-HTML-HEAD', $requiredSkinExtensions))