script: Add --no-headings option to purge-old-deployments.

This parameter is somewhat useful, and adding this also fixes a
regression where purge-old-deployments would crash since the changes
around c5580607a7 because of
inconsistent supported args lists.

scripts/lib/clean_yarn_cache.py

@@ -31,13 +31,14 @@ def remove_unused_versions_dir(args: argparse.Namespace) -> None:
     except FileNotFoundError:
         return
 
+    no_headings = getattr(args, "no_headings", False)
     may_be_perform_purging(
         dirs_to_purge,
         {current_version_dir},
         "yarn cache",
         args.dry_run,
         args.verbose,
-        args.no_headings,
+        no_headings,
     )
 
 

scripts/purge-old-deployments

@@ -43,6 +43,13 @@ def parse_args() -> argparse.Namespace:
         action="store_true",
         help="If specified then script will print a detailed report of what is going on.",
     )
+    parser.add_argument(
+        "--no-print-headings",
+        dest="no_headings",
+        action="store_true",
+        help="If specified then script will not print headings for "
+        "what will be deleted/kept back.",
+    )
 
     args = parser.parse_args()
     args.verbose |= args.dry_run  # Always print a detailed report in case of dry run.
@@ -83,6 +90,7 @@ def main() -> None:
                 ["git", "worktree", "prune"], cwd=LOCAL_GIT_CACHE_DIR, preexec_fn=su_to_zulip
             )
 
+        if not args.no_headings:
             print("Deployments cleaned successfully...")
             print("Cleaning orphaned/unused caches...")