XWIKI-12219: Remove "edit rights" at page level and add a section in the space...

XWIKI-12219: Remove "edit rights" at page level and add a section in the space administration to edit WebHome's rights.

* Fix functional test.

xwiki-platform-core/xwiki-platform-test/src/main/java/org/xwiki/test/ui/TestUtils.java

@@ -1035,6 +1035,8 @@ public boolean isInCreateMode()
     {
         return getDriver().getCurrentUrl().contains("/create/");
     }
+    
+    public boolean isInAdminMode() { return getDriver().getCurrentUrl().contains("/admin/"); }
 
     /**
      * Forces the current user to be the Guest user by clearing all coookies.