[Meta] Support automated tests of recipes

Problem/Motivation

There are several parts to this:

1. Testing that the recipe can be successfully
2. Testing that that provided config conforms to config schema
3. Testing the functionality it claims to provide - this might be the least important because it really is incumbent on the modules to test their functionality.

One exciting thing is that I think we could potentially provide some code (in core) and a Gitlab template that could do parts 1 and 2. So, all a recipe author would have to do is add a Gitlab file that includes the template, and they'll get test coverage.

Steps to reproduce

N/A

Proposed resolution

[ ] Add recipe testing to core
[ ] Create a Gitlab template to run those tests on recipe projects
[ ] TBD

Remaining tasks

All

User interface changes

TBD

API changes

TBD

Data model changes

TBD