test: over-saturation stopping

Add unit tests for over-saturation detection and constraint functionality.

Signed-off-by: Alon Kellner <[email protected]>

Author: AlonKellner-RedHat

src/guidellm/scheduler/constraints/over_saturation.py

@@ -437,6 +437,8 @@ def validated_kwargs(cls, stop_over_saturated: bool, **kwargs) -> dict[str, Any]
         """
         aliases = ["stop_over_saturated", "stop_over_sat", "stop_osd"]
         for alias in aliases:
-            stop_over_saturated = stop_over_saturated or kwargs.get(alias)
+            alias_value = kwargs.get(alias)
+            if alias_value is not None:
+                stop_over_saturated = stop_over_saturated or alias_value
 
         return {"stop_over_saturated": stop_over_saturated}