TestExtDataSources::test_catalogd_ha_failover seems flaky

tests/custom_cluster/test_ext_data_sources.py::TestExtDataSources::test_catalogd_ha_failover() failed when tried to delete data source object after catalog service failed over to standby catalogd.

Coordinator log messages showed that coordinator tried to submit request to original active catalogd since it did not received failover notification from statestored.