Splits unit tests into MULTIPLE concurrent jobs #12774

Job	Run time
Run Linters	1m 34s
Compile Maps	1m 21s
Windows Build	3m 5s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 41s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	5m 10s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	5m 1s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	3m 26s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	9m 45s
	33m 3s

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