Support passwords for Redis Sentinel
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=324871) </details> <!--IssueSummary end--> ## Summary [As of Redis 5.0.1+, Redis Sentinel supports authentication](https://redis.io/topics/sentinel#configuring-sentinel-instances-with-authentication). While gitlab-org/gitlab currently has the ability to make use of this, Workhorse does not. We should implement support across the board, as we package Reids 5.0.9 within Omnibus GitLab, and consume 5.0.7+ within the GitLab Helm charts.
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