Switch test runner from nosetest to pytest #5620

Job	Run time
Skip Duplicate Jobs Pre Job	5s
Skip Duplicate Jobs Pre Job	5s
Unit Tests (chunk 1) - Python 3.8	11m 38s
Unit Tests (chunk 1) - Python 3.8	10m 32s
Unit Tests (chunk 2) - Python 3.8	10m 33s
Unit Tests (chunk 2) - Python 3.8	10m 33s
Pack Tests - Python 3.8	2m 48s
Pack Tests - Python 3.8	2m 48s
Self-check on Python 3.8 - Python 3.8	8m 52s
Self-check on Python 3.8 - Python 3.8	8m 52s
Unit Tests (chunk 1) - Python 3.9	11m 17s
Unit Tests (chunk 1) - Python 3.9	10m 47s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 40s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 40s
Integration Tests (chunk 1) - Python 3.8	6m 55s
Integration Tests (chunk 1) - Python 3.8	6m 55s
Unit Tests (chunk 2) - Python 3.9	11m 4s
Unit Tests (chunk 2) - Python 3.9	11m 4s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 51s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 51s
Integration Tests (chunk 2) - Python 3.8	6m 8s
Integration Tests (chunk 2) - Python 3.8	6m 8s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 50s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 50s
Pack Tests - Python 3.9	2m 39s
Pack Tests - Python 3.9	2m 39s
Compile (pip deps, pylint, etc.) - Python 3.9	4m 11s
Compile (pip deps, pylint, etc.) - Python 3.9	4m 11s
Integration Tests (chunk 1) - Python 3.9	6m 49s
Integration Tests (chunk 1) - Python 3.9	6m 49s
Integration Tests (chunk 2) - Python 3.9	6m 44s
Integration Tests (chunk 2) - Python 3.9	6m 44s
Slack notification for failed master builds	4s
Slack notification for failed master builds	2s
	3h 16m 38s

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