look for the troublesome preparation file =1 mod 12

Signed-off-by: dafnapension <dafnashein@yahoo.com>

Author: dafnapension

tests/catalog/test_preparation.py

@@ -27,6 +27,10 @@
 # Make sure the order in which the tests are run is deterministic
 # Having a different order for local testing and github testing may cause diffs in results.
 all_preparation_files.sort()
+all_preparation_files = [
+    file for i, file in enumerate(all_preparation_files) if i % 12 == 1
+]
+
 num_par = 1  # num of parallel executions
 logger.critical(
     f"Over all, {len(all_preparation_files)} files will now be tested over {num_par} parallel processes."