Fixed conveyor move logic to skip directories that already existed in the spool

Conveyor's retrieval before ingestion:

1. Grabs a directory list from spool
2. Removes those that are symlinks pointing to QA
3. Moves the directories from QA to spool

Step 2 skips directories that are not symlinks but step 3 still tried to move them. Now step 3 will skip those same directories.

apps/cli/executables/pexable/conveyor/conveyor/retrieve.py

@@ -126,9 +126,12 @@ class RetrievalConveyor(ConveyorIF):
         for directory in dir_list:
             qa_dir = qa_path / directory
             spool_dir = spool_path / directory
-            self.logger.info(f"Moving directory {directory}...")
-            shutil.move(qa_dir, spool_dir)
-            self.logger.info("Done.")
+            if spool_dir.exists():
+                self.logger.info(f"Directory {directory} already existed in spool. Skipping.")
+            else:
+                self.logger.info(f"Moving directory {directory}...")
+                shutil.move(qa_dir, spool_dir)
+                self.logger.info("Done.")
 
     def determine_qa_directory(self) -> Path:
         """