Mock telemetry in pytest tests (#3340)

* 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

pyproject.toml

@@ -98,6 +98,11 @@ exclude = ["cli/templates"]
 [tool.bandit]
 exclude_dirs = ["src/crewai/cli/templates"]
 
+[tool.pytest.ini_options]
+markers = [
+    "telemetry: mark test as a telemetry test (don't mock telemetry)",
+]
+
 # PyTorch index configuration, since torch 2.5.0 is not compatible with python 3.13
 [[tool.uv.index]]
 name = "pytorch-nightly"