R1:e4049e879764

Fix verbose email addresses being passed to mail adapters

Summary:
Fixes T5233.

- The mail adapter API currently expects plain addresses (like `a@b.com`) in `addTos()`, and some adapters can not accept fancy verbose addresses (like `"name" <a@b.com>`).
- When we try to send error email, we pass the entire "From" header into the API. This is incorrect.
- Since it would be nice to make this just work in the future, fix it inside the API.
- Specifically, this is reached with: send email -> generates…