Add handling for system namespace to CheckedDistributedStorageAdmin #2703

Job	Run time
Cassandra 3.0 integration test	7m 48s
Cassandra 3.11 integration test	7m 49s
Lint dockerfiles	24s
Gradle check	3m 35s
Cosmos DB integration test	20m 13s
DynamoDB integration test	14m 11s
MariaDB 10 integration test	3m 35s
MySQL 5.7 integration test	4m 0s
MySQL 8.0 integration test	6m 2s
MySQL 8.1 integration test	5m 7s
Oracle 18 integration test	7m 31s
Oracle 21 integration test	10m 27s
Oracle 23 integration test	9m 54s
PostgreSQL 12 integration test	2m 22s
PostgreSQL 13 integration test	2m 28s
PostgreSQL 14 integration test	2m 21s
PostgreSQL 15 integration test	2m 39s
SQLite 3 integration test	4m 24s
SQL Server 2017 integration test	4m 26s
SQL Server 2019 integration test	4m 47s
SQL Server 2022 integration test	5m 9s
Multi-storage integration test	3m 17s
ScalarDB Server integration test	5m 21s
	2h 17m 50s

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