Ensure `RedisIntegration` is disabled, unless `redis` is installed #4056

Job	Run time
django, python 3.5, ubuntu-20.04	6m 20s
django, python 3.6, ubuntu-20.04	5m 26s
django, python 3.7, ubuntu-20.04	5m 39s
django, python 3.8, ubuntu-20.04	6m 20s
django, python 3.9, ubuntu-20.04	6m 29s
django, python 2.7, ubuntu-20.04	4m 49s
django, python 3.10, ubuntu-20.04	4m 56s
django, python 3.11, ubuntu-20.04	4m 55s
django, python 3.12, ubuntu-20.04	5m 24s
All django tests passed or skipped	1s
	50m 19s

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