Remove redis

[srittau]

Closes: #10592

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

prefect (https://github.com/PrefectHQ/prefect)
- src/prefect/blocks/redis.py:114: error: "Redis[bytes]" has no attribute "aclose"; maybe "close"?  [attr-defined]
+ src/prefect/blocks/redis.py:6: error: Library stubs not installed for "redis.asyncio"  [import-untyped]
+ src/prefect/blocks/redis.py:6: note: Hint: "python3 -m pip install types-redis"
+ src/prefect/blocks/redis.py:6: note: (or run "mypy --install-types" to install all missing stub packages)
+ src/prefect/blocks/redis.py:6: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+ src/prefect/blocks/redis.py:6: error: Library stubs not installed for "redis"  [import-untyped]

django-stubs (https://github.com/typeddjango/django-stubs)
+ django-stubs/core/cache/backends/redis.pyi:8: error: Library stubs not installed for "redis.client"  [import-untyped]
+ django-stubs/core/cache/backends/redis.pyi:9: error: Library stubs not installed for "redis.connection"  [import-untyped]

[Avasam]

Also closes #12149 & #12988

All redis-related items can be completed from #9006

[srittau]

Thanks, I've crossed out the redis items in #9006, closed #12988, and added #12149 to the auto-close list.