* Add telemetry mocking for pytest tests
- Mock telemetry by default for all tests except telemetry-specific tests
- Add @pytest.mark.telemetry marker for real telemetry tests
- Reduce test overhead and improve isolation
* Fix telemetry test isolation
- Properly isolate telemetry tests from mocking environment
- Preserve API keys and other necessary environment variables
- Ensure telemetry tests can run with real telemetry instances
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