Automate schema PR review requests based on CODEOWNERS

[lpsinger]

Description

Automatically request reviews from mission points of contact for changes that affect contributed mission schema.

Acceptance criteria

• Automatically request reviews from configurable points of contact when changes affect a given file. Use GitHub CODEOWNERS mechanism if possible.
• Automatically request reviews from above points of contact when a changes are made to a schema that is referenced by the given file.
• Repair, replace, or delete the broken review request workflow, https://github.com/nasa-gcn/gcn-schema/blob/main/.github/workflows/review.yml