Split up e-mail templates into containers and content.
Review Request #12712 — Created Nov. 3, 2022 and submitted
In preparation for introducing batched e-mails, this splits up each of
our e-mail templates into containers (which just have headers like the
auto-generated email blob and footers like signatures) and content.
There's a tiny bit of clean-up done but no actual changes have been made
to the content of the emails themselves.
Looked at email preview views for review requests, reviews, and review
replies in both html and text formats. Saw everything work as expected.
Accidentally included the user signature in the content for reviews.
Revision 2 (+1284 -1238)
Checks run (2 succeeded)