Removes duplicate AttributeChangeCallback class

Author: raul-marquez-csa

src/python_testing/matter_testing_support.py

@@ -391,23 +391,6 @@ def attribute_report_counts(self) -> dict[ClusterObjects.ClusterAttributeDescrip
     def attribute_reports(self) -> dict[ClusterObjects.ClusterAttributeDescriptor, AttributeValue]:
         return self._attribute_reports
 
-
-class AttributeChangeCallback:
-    def __init__(self, expected_attribute: ClusterObjects.ClusterAttributeDescriptor):
-        self._output = queue.Queue()
-        self._expected_attribute = expected_attribute
-
-    def __call__(self, path: TypedAttributePath, transaction: SubscriptionTransaction):
-        """This is the subscription callback when an attribute is updated.
-           It checks the passed in attribute is the same as the subscribed to attribute and
-           then posts it into the queue for later processing."""
-
-        asserts.assert_equal(path.AttributeType, self._expected_attribute,
-                             f"[AttributeChangeCallback] Attribute mismatch. Expected: {self._expected_attribute}, received: {path.AttributeType}")
-        logging.info(f"[AttributeChangeCallback] Attribute update callback for {path.AttributeType}")
-        q = (path, transaction)
-        self._output.put(q)
-
     def wait_for_report(self):
         try:
             path, transaction = self._output.get(block=True, timeout=10)