Replace settings save functionality with simple toast messages
### Problem
Currently our flow of saving a setting, actually involves pressing the save button. To make it worse, often the save button is out of view. This feels old and redundant and should be automated, for a more efficient flow which gives the user more confidence.
This becomes especially visible in the auto devops demo: https://youtu.be/AgKc_KUQEtE
### Proposal
Replace settings save functionality with simple temporary toast messages.
- [ ] This will need us figuring out the banner/toast usage/paradigm
cc: @tauriedavis @sarrahvesselov @mydigitalself
issue