Investigate org-level secrets with repository access settings

[ezzatron]

Org-level Actions, Codespaces, and Dependabot secrets all support a repository access setting:

API endpoints also support visibility and selected_repository_ids parameters:

• https://docs.github.com/en/rest/actions/secrets?apiVersion=2022-11-28#create-or-update-an-organization-secret
• https://docs.github.com/en/rest/codespaces/organization-secrets?apiVersion=2022-11-28#create-or-update-an-organization-secret
• https://docs.github.com/en/rest/dependabot/secrets?apiVersion=2022-11-28#create-or-update-an-organization-secret