Fixes message for 403 creating a Terraform Module package

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/330844

app/services/packages/terraform_module/create_package_service.rb

@@ -7,7 +7,7 @@ module Packages
 
       def execute
         return error('Version is empty.', 400) if params[:module_version].blank?
-        return error('Package already exists.', 403) if current_package_exists_elsewhere?
+        return error('Access Denied', 403) if current_package_exists_elsewhere?
         return error('Package version already exists.', 403) if current_package_version_exists?
         return error('File is too large.', 400) if file_size_exceeded?
 

spec/services/packages/terraform_module/create_package_service_spec.rb

@@ -37,7 +37,7 @@ RSpec.describe Packages::TerraformModule::CreatePackageService do
       let!(:existing_package) { create(:terraform_module_package, project: project2, name: 'foo/bar', version: '1.0.0') }
 
       it { expect(subject[:http_status]).to eq 403 }
-      it { expect(subject[:message]).to be 'Package already exists.' }
+      it { expect(subject[:message]).to be 'Access Denied' }
     end
 
     context 'version already exists' do