Indentify broken templates

[1v4n4]

There are (too) many "broken template" error messages (https://signal.proca.app/organizations/sentry/issues/2893/?query=is%3Aunresolved), but we have no way of knowing which template caused the problem.

We need to get as much info as possible on templates with issues (detailed error messages)

The relevant code might be here https://github.com/fixthestatusquo/proca-server/blob/main/proca/lib/proca/service/email_template.ex

[tttp]

[tttp]

This one might be the one to tackle first, as @1v4n4 was mentioning, it might be the root cause why some test emails are delayed