Write integration regression test for stored-procedure parameter description in GraphQL schema

Add an integration test that verifies a description configured on a stored-procedure parameter is correctly surfaced as the GraphQL argument description.

The test should start from a runtime config with a description set on a stored-procedure parameter, go through the full production initialization pipeline, and assert that the generated GraphQL argument description matches the configured value. It should also be verified to fail without the fix and pass with it in place.