fix: match test assertions against AirbyteTracedException message field

The pytest.raises(match=...) regex matches against the exception's string
representation, which uses the 'message' field, not 'internal_message'.
Updated the two is_done safety check tests to match against the correct
message text.

Co-Authored-By: alfredo.garcia@airbyte.io <freddy.garcia7.fg@gmail.com>

Author: devin-ai-integration[bot]

unit_tests/sources/streams/concurrent/test_concurrent_read_processor.py

@@ -1441,7 +1441,7 @@ def test_is_done_raises_when_partition_generation_queue_not_empty():
     # Artificially mark the stream as done without removing it from the partition generation queue
     handler._streams_done.add("stuck_stream")
 
-    with pytest.raises(AirbyteTracedException, match="remained in the partition generation queue"):
+    with pytest.raises(AirbyteTracedException, match="Partition generation queue is not empty"):
         handler.is_done()
 
 
@@ -1480,7 +1480,7 @@ def test_is_done_raises_when_active_groups_not_empty():
     handler._active_groups["my_group"] = {"stuck_stream"}
 
     with pytest.raises(
-        AirbyteTracedException, match="still active after all streams were marked done"
+        AirbyteTracedException, match="Active stream groups are not empty"
     ):
         handler.is_done()