Fix: auto-optout if Redis is not enabled

[lperson]

Fixes #2186

Description

The reported issue was that auto-optout is not working if redis is not enabled.

I found the root cause in lookupByCell in src/server/models/cacheable_queries/campaign-contact.js.

We were not joining to campaign_contact when redis is enabled. Because of that, in src/server/models/cacheable_queries/message.js, neither organization nor campaignId was defined, which in turn prevented any message handlers from being called.

I added tests to show:

• lookupByCell always does the join to campaign_contact
• auto-optout's members get called when we save a message

I also tested manually in the UI to show that if somebody responds with opt-out words, they do in fact get opted out.

Checklist:

• [x] I have manually tested my changes on desktop and mobile
• [x] The test suite passes locally with my changes
• [ ] If my change is a UI change, I have attached a screenshot to the description section of this pull request
• [x] My change is 300 lines of code or less, or has a documented reason in the description why it’s longer
• [ ] I have made any necessary changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [ ] My PR is labeled [WIP] if it is in progress