feat: add workflow to close superseded automation PRs

[nlucero]

Description

Add a workflow that closes all previously created automated PRs for a given feature (i.e. API Explorer), based on the PR's labels. The workflow runs on a new PR created and is a no-op if:

• PR author is not created by the auth0-docs-automation
• PR is not for the main site (indicated by the main-docs label)
• PR has not exactly one of the following labels:
  • authn-explorer-autoupdate
  • events-catalog-autoupdate
  • management-explorer-autoupdate
  • myaccount-explorer-autoupdate
  • myorg-explorer-autoupdate

References

Testing

Tested locally with act

Checklist

• I've read and followed CONTRIBUTING.md.
• I've tested the site build for this change locally.
• I've made appropriate docs updates for any code or config changes.
• I've coordinated with the Product Docs and/or Docs Management team about non-trivial changes.

[mikemimik]

❓ Question: What does --json number do?

[nlucero]

It's used to determine which JSON fields you want in the projection (similar to SELECT in sql).

$ gh pr list -h
...
--json fields       Output JSON with the specified fields
...