Update Growth Conversion feature flag YAML files

ee/config/feature_flags/development/promotion_issue_weight_session_dismiss.yml

 ---
 name: promotion_issue_weight_session_dismiss
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/23358
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/223772
+group: group::conversion
 type: development
 default_enabled: false

ee/config/feature_flags/development/promotion_issue_weight_trial_cta.yml

 ---
 name: promotion_issue_weight_trial_cta
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/23358
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/223772
+group: group::conversion
 type: development
 default_enabled: false

ee/config/feature_flags/development/trial_form_phone_optional.yml

 ---
 name: trial_form_phone_optional
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/24449
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/224606
+group: group::conversion
 type: development
 default_enabled: false