Test fix: Added return self at the end of DockerProcess.__enter__ method.

Problem: When a process finishes very quickly (before the "is running" check), the method returned None instead of the process object,
causing AttributeError: 'NoneType' object has no attribute 'wait_for_exit'.

Author: Rahul-Sutariya

quality/integration_testing/environments/ubuntu24_04_docker/docker.py

@@ -76,6 +76,8 @@ def stream_output():
             if exec_info['Running']:
                 return self
             time.sleep(0.05)
+        
+        return self
 
     def wait_for_exit(self, timeout: int = 60) -> int:
         if self._exec_id: