test(tasks): Add tests for log_task_failure signal handler

[eschutho]

SUMMARY

This PR adds test coverage for the log_task_failure signal handler that was introduced in #35595.

The original PR added the signal handler to log Celery task failures, but did not include tests. This follow-up PR adds comprehensive test coverage for the handler.

Related to #35595

TESTING INSTRUCTIONS

Run the new tests:

pytest tests/integration_tests/reports/scheduler_tests.py::test_log_task_failure_with_sender tests/integration_tests/reports/scheduler_tests.py::test_log_task_failure_without_sender -v

Both tests should pass, verifying:

• The handler logs correctly when a task sender is provided
• The handler gracefully handles None sender and logs "Unknown"

ADDITIONAL INFORMATION

• Has associated issue: Related to fix: Log Celery task failures with a signal handler #35595
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[korbit-ai]

I've completed my review and didn't find any issues.

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