Run more tests via Pants + pytest #5149

Job	Run time
Skip Duplicate Jobs Pre Job	4s
Self-check on Python 3.8 - Python 3.8	7m 32s
Lint Checks (black, flake8, etc.) - Python 3.8	3m 15s
Unit Tests (chunk 1) - Python 3.8	6m 54s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 51s
Unit Tests (chunk 2) - Python 3.8	5m 23s
Lint Checks (black, flake8, etc.) - Python 3.9	3m 18s
Pack Tests - Python 3.8	2m 38s
Unit Tests (chunk 1) - Python 3.9	7m 3s
Compile (pip deps, pylint, etc.) - Python 3.9	4m 17s
Unit Tests (chunk 2) - Python 3.9	5m 36s
Integration Tests (chunk 1) - Python 3.8	4m 32s
Integration Tests (chunk 2) - Python 3.8	5m 31s
Pack Tests - Python 3.9	2m 33s
Integration Tests (chunk 1) - Python 3.9	4m 26s
Integration Tests (chunk 2) - Python 3.9	5m 59s
Slack notification for failed master builds	2s
	1h 12m 54s

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