Merge branch 'services-usage-5' into 'master'

Use `GpgKeys::CreateService` when an admin creates a new gpg key for a user

See merge request gitlab-org/gitlab!34737

changelogs/unreleased/services-usage-5.yml

+---
+title: Use GpgKeys::CreateService when an admin creates a new GPG key for a user
+merge_request: 34737
+author: Rajendra Kadam
+type: fixed

lib/api/users.rb

@@ -328,9 +328,9 @@ module API
         user = User.find_by(id: params.delete(:id))
         not_found!('User') unless user
 
-        key = user.gpg_keys.new(declared_params(include_missing: false))
+        key = ::GpgKeys::CreateService.new(user, declared_params(include_missing: false)).execute
 
-        if key.save
+        if key.persisted?
           present key, with: Entities::GpgKey
         else
           render_validation_error!(key)