Remove the ineffective SQL injection check (#1412)

* Remove the ineffective SQL injection check

Remove the ineffective SQL-injection attack check in go/r3pr/954. It is
quite restrictive, causing a long exempt list. It also doesn't protect
queries made through helpers such as QueryComposer etc.

We will start from scratch for a new solution.

core/src/main/java/google/registry/persistence/transaction/JpaTransactionManagerImpl.java

@@ -569,7 +569,6 @@ public class JpaTransactionManagerImpl implements JpaTransactionManager {
     }
     EntityType<?> entityType = getEntityType(key.getKind());
     ImmutableSet<EntityId> entityIds = getEntityIdsFromSqlKey(entityType, key.getSqlKey());
-    // TODO(b/179158393): use Criteria for query to leave not doubt about sql injection risk.
     String sql =
         String.format("DELETE FROM %s WHERE %s", entityType.getName(), getAndClause(entityIds));
     Query query = query(sql);