Naive attempt at fixing Underscore templates

What does this MR do?

Attempts to fix part of #18939 (closed).

Are there points in the code the reviewer needs to double check?

That this doesn't break anything.

Why was this MR needed?

See #18939 (closed).

What are the relevant issue numbers?

#18939 (closed)

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing

Added 1 commit:

• 3f8dbc52 - Whoops.

Reassigned to @fatihacet

@connorshea Can you squash your last Whoops commit and then assign this to @jschatz1 since it seems it's a big issue and would be better reviewed and merged by @jschatz1.

Reassigned to @connorshea

Added 1 commit:

• 491c213a - Fix unescaped strings in Underscore templates.

Reassigned to @jschatz1

Added 407 commits:

• 3f8dbc52...f9724f9a - 407 commits from branch master

Status changed to merged

mentioned in commit 025be2f8

mentioned in issue #18939 (closed)