IBX-7021: Revert unit tests (WIP) #199

Job	Run time
Unit tests & SQLite integration tests (false, 7.1)	8m 14s
Unit tests & SQLite integration tests (false, 7.2)	8m 12s
Integration tests with Solr and Redis	15m 18s
Unit tests & SQLite integration tests (false, 7.3)	6m 35s
REST tests	10m 13s
Unit tests & SQLite integration tests (false, 7.4)	6m 37s
MySQL integration tests (7.1, 5.7)	12m 31s
MariaDB integration tests (7.1, 10.3)	21m 50s
MySQL integration tests (7.4, 5.7)	12m 14s
PostgreSQL integration tests (false, 10, 7.1)	22m 19s
MariaDB integration tests (7.4, 10.3)	21m 51s
PostgreSQL integration tests (false, 10, 7.4)	23m 25s
PostgreSQL integration tests (false, 11, 7.1)	23m 36s
PostgreSQL integration tests (false, 11, 7.4)	20m 41s
PostgreSQL integration tests (false, 14, 7.1)	23m 21s
PostgreSQL integration tests (false, 14, 7.4)	19m 24s
PostgreSQL integration tests (false, 15, 7.1)	21m 1s
PostgreSQL integration tests (false, 15, 7.4)	26m 2s
	5h 3m 24s

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