test: update 3 tests broken by terminal-step completed guard

The previous fix (requiring send_to_all_destinations to be present
before marking a file as completed) broke 3 tests that used only
partial step sets and expected "completed":

- test_coverage_polish.py::TestFileQueriesDeduplicationEnabled::
  test_deduplication_enabled_adds_check_for_duplicates
- test_file_listing.py::TestFileListingPagination::
  test_processing_status_included
- test_file_listing.py::TestFileDetailEndpoint::
  test_file_detail_status_determination

Add send_to_all_destinations: success to each test's dataset so
"completed" status is reached correctly under the new semantics.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_coverage_polish.py

@@ -477,9 +477,10 @@ class TestFileQueriesDeduplicationEnabled:
         db_session.add(file1)
         db_session.flush()
 
+        for step_name in ("check_for_duplicates", "send_to_all_destinations"):
             step = FileProcessingStep(
                 file_id=file1.id,
-            step_name="check_for_duplicates",
+                step_name=step_name,
                 status="success",
             )
             db_session.add(step)

tests/test_file_listing.py

@@ -187,10 +187,11 @@ class TestFileListingPagination:
         db_session.add(file_record)
         db_session.commit()
 
-        # Add a processing step (used for status determination)
+        # Add processing steps (used for status determination)
+        for step_name in ("extract_text", "send_to_all_destinations"):
             step = FileProcessingStep(
                 file_id=file_record.id,
-            step_name="extract_text",
+                step_name=step_name,
                 status="success",
             )
             db_session.add(step)
@@ -287,10 +288,11 @@ class TestFileDetailEndpoint:
         assert response.status_code == 200
         assert response.json()["processing_status"]["status"] == "pending"
 
-        # Test 2: Success step = completed
+        # Test 2: Success step including terminal step = completed
+        for step_name in ("extract_text", "send_to_all_destinations"):
             step = FileProcessingStep(
                 file_id=file_record.id,
-            step_name="extract_text",
+                step_name=step_name,
                 status="success",
             )
             db_session.add(step)