Added group for prog-delivery FF yml files

config/feature_flags/development/ajax_new_deploy_token.yml

 ---
 name: ajax_new_deploy_token
-introduced_by_url: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27141
 rollout_issue_url: 
-group: 
+group: group::progressive delivery
 type: development
 default_enabled: false

config/feature_flags/development/allow_group_deploy_token.yml

 ---
 name: allow_group_deploy_token
-introduced_by_url: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/23460
 rollout_issue_url: 
-group: 
+group: group::progressive delivery
 type: development
 default_enabled: true

config/feature_flags/development/forward_deployment_enabled.yml

 ---
 name: forward_deployment_enabled
-introduced_by_url: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/24412
 rollout_issue_url: 
-group: 
+group: group::progressive delivery
 type: development
 default_enabled: true