Skip quarantined open_fork_in_web_ide_spec

While leaving ability to run it manually on main

qa/qa/specs/features/browser_ui/3_create/web_ide/open_fork_in_web_ide_spec.rb

@@ -2,10 +2,13 @@
 
 module QA
   RSpec.describe 'Create' do
-    describe 'Open a fork in Web IDE', quarantine: {
+    describe 'Open a fork in Web IDE',
+      # TODO: remove limitation to only run on main when the test is fixed
+      only: { pipeline: :main },
+      quarantine: {
         issue: "https://gitlab.com/gitlab-org/gitlab/-/issues/351696",
         type: :flaky
-    } do
+      } do
       let(:parent_project) do
         Resource::Project.fabricate_via_api! do |project|
           project.name = 'parent-project'