Quarantine flaky and underinvestigation specs

qa/qa/specs/features/browser_ui/6_release/pipeline/parent_child_pipelines_dependent_relationship_spec.rb

 # frozen_string_literal: true
 
 module QA
-  context 'Release', :docker do
+  context 'Release', :docker, quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/217250', type: :investigating } do
     describe 'Parent-child pipelines dependent relationship' do
       let!(:project) do
         Resource::Project.fabricate_via_api! do |project|

qa/qa/specs/features/browser_ui/6_release/pipeline/parent_child_pipelines_independent_relationship_spec.rb

 # frozen_string_literal: true
 
 module QA
-  context 'Release', :docker do
+  context 'Release', :docker, quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/217250', type: :investigating } do
     describe 'Parent-child pipelines independent relationship' do
       let!(:project) do
         Resource::Project.fabricate_via_api! do |project|

qa/qa/specs/features/ee/browser_ui/8_monitor/all_monitor_features_spec.rb

@@ -2,7 +2,7 @@
 
 module QA
   context 'Monitor' do
-    describe 'with Prometheus Gitlab-managed cluster', :orchestrated, :kubernetes, :docker do
+    describe 'with Prometheus Gitlab-managed cluster', :orchestrated, :kubernetes, :docker, quarantine: { issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/217247', type: :flaky } do
       before :all do
         @cluster = Service::KubernetesCluster.new.create!
         Flow::Login.sign_in