test: align QuotaInsufficientError fixtures with balance_micros API

Billable calls now raise quota errors with balance_micros instead of
used_micros/limit_micros; update mocks so CI passes on main.

surfsense_backend/tests/integration/podcasts/test_draft_task.py

@@ -76,8 +76,7 @@ async def test_quota_denial_fails_the_podcast_without_a_transcript(
     async def _deny(**_kwargs):
         raise QuotaInsufficientError(
             usage_type="podcast_generation",
-            used_micros=5_000_000,
-            limit_micros=5_000_000,
+            balance_micros=5_000_000,
             remaining_micros=0,
         )
         yield  # pragma: no cover - unreachable, satisfies the CM protocol