Add support for billing budgets to project factory (#2112)

* align factory variable name in project factory module

* tested

* align fast stage

modules/billing-account/factory.tf

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+# any changes to this factory should be mirrored in the project factory
+
 locals {
   _factory_data = {
     for f in fileset("${local._factory_path}", "**/*.yaml") :