…feature/add-redis-sentinel-support

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Last commit that prefers old Redis env vars over Redis config URL env var. Will change logic to always prefer a configured Redis config URL and only generate one using the old env vars if necessary.

Contrary to the initial implementation the Redis config URL will not always be updated with Redis environment variables. Instead the Redis config URL can include bash style placeholders ${VAR} that reference those environment variables. If `AUTHENTIK_REDIS__URL` is not set i.e. in an old Authentik setup the Redis config URL is automatically generated and a warning message is issued to make the user aware of the necessary future configuration changes.

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Redis socket connections do not have socket keepalive options. Hence they shall not be present even if configured by the user.

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