Add testcase links to Web IDE E2E

Follow-up to https://gitlab.com/gitlab-org/gitlab/-/merge_requests/52444

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

@@ -35,7 +35,7 @@ module QA
           Page::Project::Show.perform(&:open_web_ide!)
         end
 
-        it 'throws an error' do
+        it 'throws an error', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1615' do
           Page::Project::WebIDE::Edit.perform do |ide|
             ide.add_directory(directory_name)
           end
@@ -51,7 +51,7 @@ module QA
           Page::Project::Show.perform(&:open_web_ide!)
         end
 
-        it 'shows in the tree view but cannot be committed' do
+        it 'shows in the tree view but cannot be committed', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1614' do
           Page::Project::WebIDE::Edit.perform do |ide|
             ide.add_directory(directory_name)