This test is only relevant for pg14-15 upgrade.
However, the check on `upgrade_distributed_triggers_after` didn't take
into consideration the case when we are doing pg15-16 upgrade. Hence, I
added one more condition to the test: existence of
`upgrade_distributed_triggers` schema which can only be created in pg14.
PRE PG15, Renaming the parent triggers on partitioned tables doesn't
recurse to renaming the child triggers on the partitions as well.
In PG15, Renaming triggers on partitioned tables
recurses to renaming the triggers on the partitions as well.
Add an upgrade test to make sure we are not breaking anything
with distributed triggers on distributed partitioned tables.
Relevant PG commit:
80ba4bb383538a2ee846fece6a7b8da9518b6866
Naisila Puka
Hanefi Onaldi