Issue #3157235: Add The Gin Admin Theme with the better experience modules to Varbase 10.0.x-dev

tests/features/varbase/03-admin-management/03-00-pre-check-important-admin-development-pages.feature

@@ -86,6 +86,7 @@ So that I can use them after the install or update.
       And I should see "Vartheme"
       And I should see "Base theme for Varbase standard websites. Based on Bootstrap 5 framework using SASS."
       And I should see "Claro"
+      And I should see "Gin"
       And I should see "Vartheme Claro"
 
    @javascript @check @local @development @staging @production

varbase.info.yml

@@ -6,7 +6,7 @@ project: varbase
 distribution:
   name: Varbase
   install:
-    theme: vartheme_claro
+    theme: claro
 version: 10.0.x-dev
 install:
   - system