There is no test for the ability to `print()` or `debugPrint()` UTF-8 non-characters and other edge cases

#184646 and similar issues can only exist because there is no test for printing these characters, which in addition to not existing is also then not run on the web platform.

(I'm submitting a PR to add a test, and the PR checklist says the PR needs to "fix" an issue, not just add tests that might reveal an issue, so I'm making an issue for how the tests don't exist yet.)

Locate the existing tests and entry points for print() and debugPrint(), including their web-platform coverage. Add coverage for UTF-8 non-characters and the other edge cases described in the issue, and confirm the test runs on the web platform.

Written by the indexing model from the issue text.