Model Migration From API to Shared

[adrian-codecov]

We are moving django models/apps from api to shared. This involves a lot of things, from moving the model itself, to supplementary code the model touches, to test files, to their migrations, etc.

Amongst many, here is some of the work encompassed by this initiative

Tasks

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1. [SHARED] - Move API Django Models to Shared #1256
   task +1
   
2. [API] - Use Core, Codecov_Auth, Reports and Legacy_Migrations Models From Shared #1427
   task +1
   
3. [API + Worker] - Make Use of Scripts In Shared #1495
   +0
4. [API + Worker] - Misc Items #1516
   +0