Wire up Upcoming Events functionality for multiple workspaces

[alysivji]

Part of #290

What does this do

Enable all workspaces to use Upcoming Events feature. Still need a way for admins to enter Meetup information and details about when / where to post announcements.

While we're at it, let's rename the folder to upcoming_events

Why are we doing this

Enable Upcoming Events feature for all workspaces

How should this be tested

• added tests, end to end tests make sure things work as expected
• [x] should probably test how a single workspace with 2 groups works in terms of information that is shown

Migrations

We ran the data migration; now let's make this column non-nullable.

Dependencies

n/a

Callouts

• deleted code that had custom functionality for known workspaces

[codecov-commenter]

Codecov Report

Merging #292 into master will decrease coverage by 0.11%. The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
- Coverage   94.83%   94.72%   -0.12%     
==========================================
  Files          71       70       -1     
  Lines        2071     2065       -6     
==========================================
- Hits         1964     1956       -8     
- Misses        107      109       +2     

Impacted Files	Coverage Δ
busy_beaver/apps/upcoming_events/blueprint.py	100.00% <ø> (ø)
busy_beaver/apps/upcoming_events/models.py	72.54% <ø> (ø)
busy_beaver/apps/upcoming_events/sync_database.py	100.00% <ø> (ø)
busy_beaver/config.py	100.00% <ø> (ø)
busy_beaver/apps/slack_integration/blocks.py	77.27% <66.66%> (ø)
...eaver/apps/slack_integration/event_subscription.py	95.69% <66.66%> (+2.99%)	:arrow_up:
busy_beaver/apps/upcoming_events/cli.py	93.10% <66.66%> (ø)
...usy_beaver/apps/slack_integration/slash_command.py	94.89% <73.33%> (-4.00%)	:arrow_down:
busy_beaver/apps/upcoming_events/cards.py	100.00% <100.00%> (ø)
...usy_beaver/apps/upcoming_events/upcoming_events.py	100.00% <100.00%> (ø)
... and 2 more

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