Sort slow tests json by test name (#55862)
Summary:
This will make https://github.com/pytorch/test-infra/commits/master more readable in the future
Pull Request resolved: https://github.com/pytorch/pytorch/pull/55862
Reviewed By: ngimel
Differential Revision: D27728462
Pulled By: malfet
fbshipit-source-id: 2f10dd7ace49f343c4b91fc02be9d955fdbf67cc
