IBX-9322: ezobjectrelationlist field allows selecting the same content multiple times #6321

Job	Run time
Run code style check (8.0)	59s
Tests (7.4)	52s
Tests (8.0)	47s
Tests (8.1)	57s
PostgreSQL integration tests (7.4)	53s
MySQL integration tests (7.4)	1m 2s
PostgreSQL integration tests (8.0)	53s
MySQL integration tests (8.0)	1m 11s
PostgreSQL integration tests (8.1)	53s
MySQL integration tests (8.1)	1m 3s
	9m 30s

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