Backfill group info for feature flags

Adds group info (and some roll-out links) to a couple of feature flags.

config/feature_flags/development/service_desk_custom_address.yml

@@ -2,6 +2,6 @@
 name: service_desk_custom_address
 introduced_by_url: 
 rollout_issue_url: 
-group: 
+group: group::certify
 type: development
 default_enabled: false

config/feature_flags/development/users_search.yml

 ---
 name: users_search
 introduced_by_url: 
-rollout_issue_url: 
-group: 
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/255282
+group: group::global search
 type: development
 default_enabled: true

ee/config/feature_flags/development/requirements_management.yml

 ---
 name: requirements_management
 introduced_by_url: 
-rollout_issue_url: 
-group: 
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/255285
+group: group::certify
 type: development
 default_enabled: true