PS-9293, PS-9328: Disabled binlog.binlog_mysqlbinlog_4g_start_position rocksdb_stress.drop_cf_stress tests.

Disabled two tests which create too much noise in Jenkins and which we
could not/do not plan to fix immediately.

binlog.binlog_mysqlbinlog_4g_start_position test requires too much memory/
space so often fails in Jenkins even when run alone.

rocksdb_stress.drop_cf_stress test executes concurrently mix of DDL and
often fails due to race.

Author: dlenev

mysql-test/collections/disabled.def

@@ -21,6 +21,7 @@ audit_null.audit_plugin_bugs : BUG#28080637 Test fails consistently
 
 # binlog suite tests
 binlog.binlog_mysqlbinlog_rewrite_db @windows     : BUG#26717205 Requires a debug client binary and fails consistently.
+binlog.binlog_mysqlbinlog_4g_start_position       : BUG#0000 PS-9381 Requires too much memory/space in Jenkins
 binlog_gtid.binlog_xa_select_gtid_executed_explicitly_crash : Bug#28588717 Fails both on FreeBSD and other platforms
 binlog_nogtid.binlog_gtid_next_xa                 : BUG#33650776 Failure of XA COMMIT of prepared txn, can result in txn rollback
 # func1 suite tests
@@ -86,6 +87,9 @@ perfschema.idx_compare_ews_by_thread_by_event_name : BUG#31041671
 perfschema.idx_compare_ews_by_instance : BUG#31791537
 perfschema.idx_compare_rwlock_instances : BUG#31791537
 
+# rocksdb_stress suite tests
+rocksdb_stress.drop_cf_stress : BUG#0000 PS-9381 Often fails in Jenkins due to races.
+
 # rpl_gtid suite tests
 rpl_gtid.rpl_async_conn_failover_restart @windows : BUG#34132168 Disabled until bug is fixed
 rpl_gtid.rpl_gtid_truncate_memory_table_after_start_server : BUG#24351040