Update release notes scripts following runbook update (#54594)
Summary:
This adds:
- new categories
- global commit counter
- support for new "Reverted" label on PRs
- new export system to multiple files
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54594
Reviewed By: H-Huang
Differential Revision: D27396011
Pulled By: albanD
fbshipit-source-id: ca1ec3a1b90221ba26fd8b053dfb10f614f05909
