[easy] Reword unexpected success error messages and generated github issues now that we have sentinel files (#120766)
It's a bit annoying to have to read through the test name in verbose mode just to see what the test's sentinel file is actually called when encountering an unexpected success. Now that we have sentinel files, we can directly list the file path from root in the error message.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120766
Approved by: https://github.com/Skylion007
