Disable mingle and gossip when running workers.

[kollivier]

Description

During the bug bash, we realized that workers mingling and gossiping was causing them to lose track of their tasks and leave them unprocessed. Make it so that workers can no longer mingle and gossip, so that they can focus on their work.

Steps to Test

• Run any celery task, make sure it runs

Checklist

• Is the code clean and well-commented?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@35d2bd6). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #1519   +/-   ##
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  Coverage           ?   79.27%           
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  Files              ?      250           
  Lines              ?    11636           
  Branches           ?        0           
==========================================
  Hits               ?     9224           
  Misses             ?     2412           
  Partials           ?        0

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