Test Update and Downgrade

Backport to 2.15.x: #7080: Fix `corresponding equivalence member not found` #23478

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Run time

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Job	Run time
Update test PG13	5m 36s
Update test PG14	5m 42s
Update test PG15	3m 16s
Update test PG16	2m 4s
	16m 38s