Remove Retweeter feature

[alysivji]

What does this do

Removing the retweeter feature. The Slack Twitter integration does this a lot better than we can ever do.

Why are we doing this

This feature was originally implemented to get around having to ask Workspace Admins to change some settings. Now that I have access to Slack integration settings, I can use the better integration.

How should this be tested

Do tests still pass?

Migrations

Deleting keyvalue table since we don't need it. Can always create it again if required.

Dependencies

n/a

Callouts

• remove twitter config from AWS Secrets Manager for staging and production

[codecov-commenter]

Codecov Report

Merging #323 into master will decrease coverage by 0.41%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   92.48%   92.06%   -0.42%     
==========================================
  Files          71       66       -5     
  Lines        2394     2295      -99     
==========================================
- Hits         2214     2113     -101     
- Misses        180      182       +2     

Impacted Files	Coverage Δ
busy_beaver/apps/slack_integration/models.py	100.00% <ø> (ø)
busy_beaver/blueprints.py	100.00% <ø> (ø)
busy_beaver/common/models.py	100.00% <ø> (ø)
busy_beaver/common/wrappers/__init__.py	100.00% <ø> (ø)
busy_beaver/config.py	100.00% <ø> (ø)
busy_beaver/app.py	98.00% <100.00%> (-0.04%)	⬇️
busy_beaver/clients.py	100.00% <100.00%> (ø)
busy_beaver/models.py	100.00% <100.00%> (ø)
busy_beaver/apps/web/views.py	77.59% <0.00%> (-0.19%)	⬇️
busy_beaver/apps/web/forms.py	100.00% <0.00%> (ø)

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