Rename API::Internal class to API::Internal::Base

so that we can use API::Internal namespace.

Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/61927.

.rubocop_todo.yml

@@ -218,7 +218,7 @@ Lint/UriEscapeUnescape:
     - 'app/models/project_services/drone_ci_service.rb'
     - 'spec/lib/google_api/auth_spec.rb'
     - 'spec/requests/api/files_spec.rb'
-    - 'spec/requests/api/internal_spec.rb'
+    - 'spec/requests/api/internal/base_spec.rb'
 
 # Offense count: 1
 # Configuration parameters: CheckForMethodsWithNoSideEffects.

lib/api/api.rb

@@ -118,7 +118,7 @@ module API
     mount ::API::GroupContainerRepositories
     mount ::API::GroupVariables
     mount ::API::ImportGithub
-    mount ::API::Internal
+    mount ::API::Internal::Base
     mount ::API::Issues
     mount ::API::JobArtifacts
     mount ::API::Jobs

spec/requests/api/internal_spec.rb → spec/requests/api/internal/base_spec.rb

 require 'spec_helper'
 
-describe API::Internal do
+describe API::Internal::Base do
   set(:user) { create(:user) }
   let(:key) { create(:key, user: user) }
   set(:project) { create(:project, :repository, :wiki_repo) }