Remove Tier calculation from BE service and only keep number of subscribers

[dmtrjsg]

@dmtrjsg commented on Wed Nov 23 2022

Context

Decision was made to move the Tiers configuration to the App side, so needs to be remove from BE.

Scope

• [ ] Remove Tiers calculation from BE and only keep subscribers.
• [ ] Update all related API endpoints

[zeeshanakram3]

Addressed in #63