Remove test reporter from GHA CI

[Swimburger]

I don't think the test reporter is worth the hassle.
It only works for PRs made by users with contribution permissions on the repo.
This change removes the test reporter so you just look at the logs instead of a report to figure out what's up with the tests.

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• I acknowledge that all my contributions will be made under the project's license.

[Swimburger]

@dprothero Can you review this for me? 🙇