Feature flag for GitHub Summary feature

[alysivji]

Part of #186

What does this do

• add feature flag field to GitHub Summary; workspace admins can enable / disable
• workspaces can enable or disable the creation of daily summaries

Why are we doing this

Multitenancy requires admins to control features.

How should this be tested

• wrote a test for the job
• manually tested toggle button in admin interface

Migrations

Added a field which requires a data migration

Dependencies

n/a

Callouts

• need to fix login

[codecov-commenter]

Codecov Report

Merging #288 into master will decrease coverage by 1.10%.
The diff coverage is 60.27%.

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
- Coverage   96.51%   95.40%   -1.11%     
==========================================
  Files          71       71              
  Lines        1981     2025      +44     
==========================================
+ Hits         1912     1932      +20     
- Misses         69       93      +24     

Impacted Files	Coverage Δ
busy_beaver/apps/web/views.py	70.58% <20.00%> (-12.75%)	⬇️
busy_beaver/apps/github_integration/models.py	69.38% <48.27%> (-30.62%)	⬇️
busy_beaver/exceptions.py	84.21% <60.00%> (-4.37%)	⬇️
busy_beaver/app.py	97.77% <100.00%> (+3.77%)	⬆️
busy_beaver/apps/github_integration/cli.py	100.00% <100.00%> (+7.40%)	⬆️
...beaver/apps/github_integration/summary/workflow.py	96.55% <100.00%> (ø)

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