Remove raw SQL condition from CollectionFileSizeTrigger.

The `pgtrigger.Condition('OLD.* IS DISTINCT FROM NEW.*')` condition is
equivalent to `pgtrigger.AnyChange()`, which is easier to inspect and reason
about. This change replaces the former with the latter.

Author: adk-swisstopo

app/stac_api/pgtriggers.py

@@ -349,7 +349,7 @@ class IncreaseCounterTrigger(pgtrigger.Trigger):
         CollectionFileSizeTrigger(
             name='update_col_asset_col_file_size_trigger',
             operation=pgtrigger.Update,
-            condition=pgtrigger.Condition('OLD.* IS DISTINCT FROM NEW.*'),
+            condition=pgtrigger.AnyChange(),
         )
     ]