Async task to queue post_summary jobs for the next day

[alysivji]

Part of #260

What does this do

• convert CRON job to post message to CRON job that schedules post message jobs for the next day
• currently works when you pass in a workspace id, but it can be generalized for all active workspaces
  • we need to roll this out by adding an active / enabled boolean field

Why are we doing this

This will allow us to add additional installations without having to do work on our side.

How should this be tested

• added a unit test for the CLI job
• tests around the job

Migrations

• cleaning up previous task Model) that was truncated
• adding additional fields
• TODO make into a single migration

Dependencies

n/a

Callouts

n/a

[codecov-commenter]

Codecov Report

Merging #285 into master will increase coverage by 0.03%.
The diff coverage is 97.56%.

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
+ Coverage   96.56%   96.60%   +0.03%     
==========================================
  Files          71       71              
  Lines        1952     1975      +23     
==========================================
+ Hits         1885     1908      +23     
  Misses         67       67              

Impacted Files	Coverage Δ
...beaver/apps/github_integration/summary/workflow.py	96.55% <92.30%> (-3.45%)	⬇️
busy_beaver/apps/github_integration/cli.py	100.00% <100.00%> (+5.88%)	⬆️
busy_beaver/common/models.py	100.00% <100.00%> (ø)
busy_beaver/toolbox/rq.py	100.00% <100.00%> (ø)

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