feat: do not remove time filters in ScanRegion (#5180)

* feat: do not remove time filters

* chore: remove `time_range` from parquet reader

* chore: print more message in the check script

* chore: fix unused error

scripts/check-snafu.py

@@ -58,8 +58,10 @@ def main():
         if not check_snafu_in_files(branch_name, other_rust_files)
     ]
 
-    for name in unused_snafu:
-        print(name)
+    if unused_snafu:
+        print("Unused error variants:")
+        for name in unused_snafu:
+            print(name)
 
     if unused_snafu:
         raise SystemExit(1)