Rails 7 upgrade

[donrestarone]

TO-DO:

1. Create branches for Violet Rails master and staging running on Rails 7 (rails_7_master, rails_7_staging) from the HEAD of master
2. on the rails_7_staging branch upgrade to Rails 7 and attempt CI and deployment to Heroku
3. iterate on it till we have a rails_7_staging passing CI and Heroku deployment.
4. merge rails_7_staging to rails_7_master
5. use a one-off EC2 instance and test on it to vet rails_7_master
6. make the necessary changes
7. deploy rails_7_master to staging (restarone.solutions)
8. if everything goes well, create a release candidate and merge rails_7_master to rc
9. Create new base AMI's for production use
10. Deploy to fresh EC2 instances and cut traffic over when they are ready