I was reading the docs for using the render function and noticed this:

Render into a container which is appended to document.body. It should be used with cleanup.

Since we're using a custom render I think it's expected we call cleanup after each test. After adding it, I noticed a significant number of act warnings disappear. It doesn't reduce all of them, but it's progress.

The remaining ones are mostly warnings related to submitForm and then an act warning in TemplatePage.test.tsx.

Related to #3626