Refactor release only changes to two step execution (#121728)
Refactor release only changes to two step execution.
1. Step ``tag-docker-images.sh`` . Tags latest docker images for current release. This step takes about 30min to complete. This step may fail due to space issues on the local host or http connection when pulling image. Hence should be rerun if failed.
2. Apply release only changes ``apply-release-changes.sh`` prepares a PR with release only changes.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121728
Approved by: https://github.com/jeanschmidt
