Speedup tests by running in parallel

Ghost Userrequested to merge
istaester/run-test-in-parallel into develop

Speedup tests by running low hanging fruits (aka slow test) in parallel if possible.

Old: DONE 346 tests, 9 skipped in 678.943s

New: DONE 346 tests, 9 skipped in 524.596s

Edited by Ghost User

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