Make tests safer to run in parallel by changing the Redis key namespace #5557

Job	Run time
Skip Duplicate Jobs Pre Job	4s
Unit Tests (chunk 1) - Python 3.8	9m 38s
Lint Checks (black, flake8, etc.) - Python 3.8	2m 7s
Unit Tests (chunk 2) - Python 3.8	5m 33s
Compile (pip deps, pylint, etc.) - Python 3.8	3m 2s
Pack Tests - Python 3.8	2m 46s
Lint Checks (black, flake8, etc.) - Python 3.9	2m 7s
Unit Tests (chunk 1) - Python 3.9	6m 10s
Self-check on Python 3.8 - Python 3.8	7m 43s
Integration Tests (chunk 1) - Python 3.8	5m 21s
Compile (pip deps, pylint, etc.) - Python 3.9	3m 20s
Unit Tests (chunk 2) - Python 3.9	5m 48s
Integration Tests (chunk 2) - Python 3.8	6m 18s
Pack Tests - Python 3.9	3m 2s
Integration Tests (chunk 1) - Python 3.9	5m 9s
Integration Tests (chunk 2) - Python 3.9	6m 28s
Slack notification for failed master builds	3s
	1h 14m 39s

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