Unquarantine and fix issue board label spec

qa/qa/ee/page/component/issue_board/show.rb

@@ -31,7 +31,12 @@ module QA
 
             def configure_by_label(label)
               click_boards_config_button
-              click_element(:labels_edit_button)
+
+              QA::Support::Retrier.retry_on_exception do
+                click_element(:labels_edit_button)
+                find_element(:labels_dropdown_content)
+              end
+
               find_element(:labels_dropdown_content).find('li', text: label).click
               # Clicking the edit button again closes the dropdown and allows the save button to be clicked
               click_element(:labels_edit_button)

qa/qa/specs/features/ee/browser_ui/2_plan/issue_boards/configure_issue_board_by_label_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Plan', quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/344780', type: :flaky } do
+  RSpec.describe 'Plan' do
     describe 'Configure issue board by label' do
       let(:label_board_list) do
         EE::Resource::Board::BoardList::Project::LabelBoardList.fabricate_via_api!