IBX-9322: ezobjectrelationlist field allows selecting the same content multiple times #6320

Job	Run time
Run code style check (8.0)	1m 1s
Tests (7.4)	49s
Tests (8.0)	47s
Tests (8.1)	48s
PostgreSQL integration tests (7.4)	1m 0s
MySQL integration tests (7.4)	1m 1s
PostgreSQL integration tests (8.0)	1m 1s
MySQL integration tests (8.0)	1m 8s
PostgreSQL integration tests (8.1)	1m 8s
MySQL integration tests (8.1)	54s
	9m 37s

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