Don't actually print anomalies in TTRR (#54078)
Summary:
This PR disables the bulk of the output for test time regression reporting, since it's obscuring more important signal (especially in cases where shards are shifting around).
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54078
Test Plan:
```
python test/test_testing.py
```
Reviewed By: ezyang, walterddr
Differential Revision: D27088987
Pulled By: samestep
fbshipit-source-id: 06a4eeb75641552bad2ab4b9154a8c70c57b0d68
