Fix: Disable scheduler warning in task mode

- Add condition to check if we're in task mode (self._active_task is not None)
- Skip scheduler warning when in task mode since scheduler is intentionally stopped
- Preserves warning functionality in normal mode when there are actual delays
- Tested with task mode examples and integration tests

Co-authored-by: benoit-cty <6603048+benoit-cty@users.noreply.github.com>

Author: Copilot

codecarbon/emissions_tracker.py

@@ -843,7 +843,7 @@ def _measure_power_and_energy(self) -> None:
             raise e
 
         warning_duration = self._measure_power_secs * 3
-        if last_duration > warning_duration:
+        if last_duration > warning_duration and self._active_task is None:
             warn_msg = (
                 "Background scheduler didn't run for a long period"
                 + " (%ds), results might be inaccurate"