Test

pants ci: add integration tests jobs #1447

Job	Run time
Integration Tests Shard 0/1 (pants runs: pytest) - Python 3.8	8m 42s
Integration Tests Shard 0/1 (pants runs: pytest) - Python 3.9	4m 30s
Pack Tests (pants runs: pytest) - Python 3.8	7m 53s
Pants Plugins Tests (pants runs: pytest) - Python 3.9	1m 38s
Pack Tests (pants runs: pytest) - Python 3.9	2m 18s
Unit Tests Shard 0/4 (pants runs: pytest) - Python 3.8	1m 58s
Unit Tests Shard 1/4 (pants runs: pytest) - Python 3.8	3m 8s
Unit Tests Shard 2/4 (pants runs: pytest) - Python 3.8	1m 36s
Unit Tests Shard 3/4 (pants runs: pytest) - Python 3.8	3m 55s
Unit Tests Shard 0/4 (pants runs: pytest) - Python 3.9	10m 4s
Unit Tests Shard 1/4 (pants runs: pytest) - Python 3.9	6h 0m 17s
Unit Tests Shard 2/4 (pants runs: pytest) - Python 3.9	4m 40s
Unit Tests Shard 3/4 (pants runs: pytest) - Python 3.9	6m 33s
Set Merge OK (Tests)	0s
Merge OK (Tests)	1s
	6h 57m 13s

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