Github comments when user is warned/removed (in addition to the emails that are sent when this happens)

[owocki]

Description

Github comments from gitcoinbot when a user is removed from the issue.

example issue

This gives context to anyone looking back at the thread to try and figure out what is going on with the issue that the github bot has kicked them off of the issue.

In addition, this PR will enable notifications to slack so that we can deal with it internally

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

bot

Testing

tested

Refers/Fixes

self

[owocki]

another route we could go is just to disable the auto-kick functinoality. instead, we could make the bot just warn the user in perpetuity

[codecov]

Codecov Report

Merging #897 into master will decrease coverage by 14.69%.
The diff coverage is 12.24%.

@@            Coverage Diff             @@
##           master     #897      +/-   ##
==========================================
- Coverage   33.52%   18.83%   -14.7%     
==========================================
  Files          99       98       -1     
  Lines        6073     6463     +390     
  Branches      731      815      +84     
==========================================
- Hits         2036     1217     -819     
- Misses       3946     5235    +1289     
+ Partials       91       11      -80

Impacted Files	Coverage Δ
...eting/management/commands/expiration_start_work.py	15.87% <33.33%> (-63.44%)	⬇️
app/dashboard/notifications.py	8.28% <9.3%> (-6.17%)	⬇️
app/external_bounties/router.py	0% <0%> (-100%)	⬇️
app/external_bounties/forms.py	0% <0%> (-100%)	⬇️
app/app/urls.py	0% <0%> (-93.55%)	⬇️
app/app/sitemaps.py	0% <0%> (-72.5%)	⬇️
app/dashboard/tokens.py	33.33% <0%> (-66.67%)	⬇️
app/marketing/management/commands/sync_keywords.py	29.16% <0%> (-66.67%)	⬇️
app/marketing/management/commands/expiration.py	33.33% <0%> (-57.15%)	⬇️
app/marketing/management/commands/roundup.py	29.41% <0%> (-52.95%)	⬇️
... and 32 more

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[mbeacom]

This import will fail. maybe_notify_bounty_user_removed_to_slack and maybe_notify_bounty_user_warned_removed_to_slack

[mbeacom]

lgtm