Make unit tests use redis #5248

Job	Run time
Skip Duplicate Jobs Pre Job	5s
Pack Tests - Python 3.8	1m 41s
Integration Tests (chunk 1) - Python 3.8	2m 7s
Integration Tests (chunk 2) - Python 3.8	2m 6s
Lint Checks (black, flake8, etc.) - Python 3.8	54s
Pack Tests - Python 3.9	1m 43s
Self-check on Python 3.8 - Python 3.8	1m 55s
Compile (pip deps, pylint, etc.) - Python 3.8	2m 7s
Integration Tests (chunk 1) - Python 3.9	2m 6s
Unit Tests (chunk 1) - Python 3.8	2m 8s
Lint Checks (black, flake8, etc.) - Python 3.9	1m 36s
Integration Tests (chunk 2) - Python 3.9	2m 7s
Unit Tests (chunk 2) - Python 3.8	1m 12s
Compile (pip deps, pylint, etc.) - Python 3.9	2m 4s
Unit Tests (chunk 1) - Python 3.9	2m 6s
Unit Tests (chunk 2) - Python 3.9	1m 59s
Slack notification for failed master builds	3s
	27m 59s

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