UN-2813 Minor fixes

Author: Deepak-Kesavan

unstract/task-abstraction/src/unstract/task_abstraction/backends/celery.py

@@ -37,12 +37,9 @@ def __init__(self, config: BackendConfig | None = None):
 
         Args:
             config: Backend configuration with Celery connection parameters
-
-        Note:
-            Configure retries, DLQ, persistence in Celery configuration, not here.
         """
         if not CELERY_AVAILABLE:
-            raise ImportError("Celery is not installed. Install with: pip install celery")
+            raise ImportError("Missing dependency: celery")
 
         super().__init__(config)
         logger.info("Initializing Celery backend")

unstract/task-abstraction/src/unstract/task_abstraction/backends/hatchet.py

@@ -34,9 +34,7 @@ def __init__(self, config: BackendConfig | None = None):
             config: Backend configuration with Hatchet connection parameters
         """
         if not HATCHET_AVAILABLE:
-            raise ImportError(
-                "Hatchet SDK is not installed. Install with: pip install hatchet-sdk"
-            )
+            raise ImportError("Missing dependency: hatchet-sdk")
 
         super().__init__()