Async event mapping for all postgres instances

[mariusandra]

Changes

• Duplicate of Async event mapping for all Postgres instances #3626 , just trying to get tests to work 🤷

Checklist

• All querysets/queries filter by Organization, by Team, and by User
• Django backend tests
• Jest frontend tests
• Cypress end-to-end tests

[mariusandra]

I had to tweak many tests and add code to manually calculate the actions after events got added. Should be fine. The only problem I couldn't figure out was why the order of returned breakdown cohorts changed... but I think it's also fine... possibly?

Got to run, will leave it running to see what GitHub tests do

[Twixes]

Superseded by #3678.