fix(test): remove incorrect decorator from credential_deployment_part_1

- Remove @contextmanager decorator from credential_deployment_part_1 method
- Fix test flow for credential deployment process

Removes incorrectly added context manager decorator that was not needed for
this specific credential deployment method.

tests/application_client/boilerplate_command_sender.py

@@ -436,7 +436,6 @@ def export_private_key(
         ) as response:
             yield response
 
-    @contextmanager
     def credential_deployment_part_1(
         self,
         path: str,