Fix Sidekiq ActiveJob integration setup

* .connect on a Redis connection wasn't valid
* Reset logger after we're done testing for redis connection to avoid
  "closed stream" error when starting server for real from a fork
Merge pull request #17825 from aripollak/fix-activejob-sidekiq-integration

Fix Sidekiq ActiveJob integration setup

Conflicts:
	activejob/test/support/integration/adapters/sidekiq.rb