Automate seed node issue alert on API release

[smk762]

To better manage seed node update announcements for NNs, we should be able to use actions + github API to:

• create an issue in this repo to alert about the release
• create a draft PR with:
  • update instructions doc (this might need to include other updates if there are any required around the same time - we cant automate that but we can merge it in)
  • update the seed node scoring json file
  • update the readme to show which version(s) are currently eligible for scoring