Springify the project
Use jbuilder to render json

[Finishes #52400689]
Cleanup Gemfile
Refactor scope methods
Remove duplicate code

Project#tracker_configured? is the exact same as
Project#tracker_project?.
Remove duplicate test

Volatility class was introduced on 537f3347addae7424ddef2f4aed5c08839fc18 and it has its own tests so we don't have to test it twice.
Remove unneeded method/test

Project table has 'building' column so what we are testing here doesn't
make sence.

In fixture, :red_currently_building project has building: true and the
other 2 don't and the spec checks if the column is correctly set to true/false?
We don't have to test it.
Refactor Project status

[Finishes #52400503]
Add Jordi to .pairs and remove ex-pivots