Pants CI: Run all unit and pack tests #5385

Job	Run time
Skip Duplicate Jobs Pre Job	6s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 9s
Self-check on Python 3.8 - Python 3.8	8m 44s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 2s
Unit Tests (chunk 1) - Python 3.8	6m 59s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 13s
Unit Tests (chunk 2) - Python 3.8	5m 49s
Pack Tests - Python 3.8	2m 55s
Compile (pip deps, pylint, etc.) - Python 3.9	3m 21s
Unit Tests (chunk 1) - Python 3.9	7m 13s
Integration Tests (chunk 1) - Python 3.8	5m 46s
Unit Tests (chunk 2) - Python 3.9	5m 32s
Integration Tests (chunk 2) - Python 3.8	6m 5s
Pack Tests - Python 3.9	2m 59s
Integration Tests (chunk 1) - Python 3.9	5m 17s
Integration Tests (chunk 2) - Python 3.9	6m 13s
Slack notification for failed master builds	2s
	1h 14m 25s

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