Update attribute indirection

Use attribute which is behind a feature flag when getting a managed
license approval_status. This was missed in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/79266.

Changelog: fixed
EE: true

ee/lib/ee/api/entities/managed_license.rb

@@ -4,8 +4,7 @@ module EE
   module API
     module Entities
       class ManagedLicense < Grape::Entity
-        expose :id, :name
-        expose :legacy_approval_status, as: :approval_status
+        expose :id, :name, :approval_status
       end
     end
   end

ee/spec/features/projects/licenses/maintainer_views_policies_spec.rb

@@ -12,6 +12,7 @@ RSpec.describe 'EE > Projects > Licenses > Maintainer views policies', :js do
 
   before do
     stub_licensed_features(license_scanning: true)
+    stub_feature_flags(lc_remove_legacy_approval_status: false)
 
     sign_in(maintainer)
     visit(project_licenses_path(project))

ee/spec/requests/api/managed_licenses_spec.rb

@@ -11,6 +11,7 @@ RSpec.describe API::ManagedLicenses do
 
   before do
     stub_licensed_features(license_scanning: true)
+    stub_feature_flags(lc_remove_legacy_approval_status: false)
     project.add_maintainer(maintainer_user)
     project.add_developer(dev_user)
     project.add_reporter(reporter_user)