IBX-5905: Implemented LoadContent events #2083

Job	Run time
Run code style check (8.0)	3m 11s
Solr integration tests (7.4)	13m 6s
Unit tests & SQLite integration tests (7.4)	8m 54s
Solr integration tests (8.0)	13m 7s
Unit tests & SQLite integration tests (8.0)	9m 12s
Solr integration tests (8.1)	12m 44s
Unit tests & SQLite integration tests (8.1)	8m 52s
MySQL integration tests (7.4)	15m 19s
PostgreSQL integration tests (7.4)	24m 56s
MySQL integration tests (8.0)	14m 33s
PostgreSQL integration tests (8.0)	28m 25s
MySQL integration tests (8.1)	14m 24s
PostgreSQL integration tests (8.1)	25m 45s
	3h 12m 28s

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