Add two missing feature flag rollout issues

config/feature_flags/development/ci_instance_variables_ui.yml

 ---
 name: ci_instance_variables_ui
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/33510
-rollout_issue_url: 
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/299879
 milestone: '13.1'
 type: development
 group: group::continuous integration

config/feature_flags/development/ci_store_pipeline_messages.yml

 ---
 name: ci_store_pipeline_messages
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/33762
-rollout_issue_url: 
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/224199
 milestone: '13.2'
 type: development
 group: group::continuous integration