IBX-8534: Fixed missing loadRelation method on ContentHandler #267

Job	Run time
Integration tests (8.3, 7.7.3, dedicated)	10m 10s
Integration tests (8.3, 7.7.3, shared)	12m 53s
Integration tests (8.3, 7.7.3, single)	12m 7s
Integration tests (8.3, 7.7.3, cloud)	12m 6s
Integration tests (8.3, 8.11.2, dedicated)	14m 21s
Integration tests (8.3, 8.11.2, shared)	12m 23s
Integration tests (8.3, 8.11.2, single)	13m 13s
Integration tests (8.3, 8.11.2, cloud)	12m 26s
	1h 39m 39s

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