Clarify tools/test_history.py output for re-runs (#55106)
Summary:
This PR clarifies the output of `tools/test_history.py` in the presence of re-runs for a single commit/job pair. Specifically:
- in `multiline` mode, the results from all re-runs are now shown
- in `columns` mode, the wording is now changed from "S3 reports omitted" to "job re-runs omitted"
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55106
Test Plan:
```
python tools/test/test_test_history.py
```
Reviewed By: walterddr
Differential Revision: D27480590
Pulled By: samestep
fbshipit-source-id: 5b4ccae7586ef1df744663cba1c16bb5bfa75bb7
