Add a holiday check to the production tag process, including an override.

[timcosgrove]

Description

This installs a holiday checker for the production tag creator for Next Build. It checks for whether we are in a holiday state, and does not cut a production tag

Ticket

department-of-veterans-affairs/va.gov-cms#19910

Developer Task

Tasks

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1. PR submitted against the main branch of next-build.
2. Link to the issue that this PR addresses (if applicable).
3. Define all changes in your PR and note any changes that could potentially be breaking changes.
4. PR includes steps to test your changes and links to these changes in the Tugboat preview (if applicable).
5. Provided before and after screenshots of your changes (if applicable).
6. Alerted the #accelerated-publishing Slack channel to request a PR review.
7. You understand that once approved, you are responsible for merging your changes into main. (Note that changes to main will move automatically into production.)

Testing Steps

This is testable from this branch for testing, both without and with the override in place.

• No override: https://github.com/department-of-veterans-affairs/next-build/actions/runs/12486271581
• Override: https://github.com/department-of-veterans-affairs/next-build/actions/runs/12486284360 (successfully passed to tag creation; workflow subsequently cancelled to not violate code freeze).