fix: fine-tune code removing patterns to skip Woo Coming Soon patterns

[laurelfulford]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

The Block Theme currently has some code that removes all patterns registered outside of Newspack, to help simplify pattern selection and help focus publishers on what we've bundled.

This has had the unfortunately side-effect of obliterating WooCommerce's 'Coming Soon' page, as the pattern is not available on the front-end 😅

This PR adds a check for those patterns specifically and makes sure they don't get removed. We may want to add our own version of this page in the future, but as is, it does the trick for now.

How to test the changes in this Pull Request:

1. Ensure WooCommerce is in 'Coming Soon' mode (WooCommerce > Settings > Site Visibility)
2. In an incognito window, go to your /shop page; note nothing loads.
3. Apply this PR.
4. Refresh the incognito window; confirm you get the theme's header and footer, and a coming soon message.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Copilot]

Pull request overview

Adjusts the theme’s pattern-cleanup logic to avoid unregistering WooCommerce “Coming Soon” patterns, which are required for the Coming Soon template to render correctly on the frontend and in the Site Editor.

Changes:

• Exempts woocommerce/coming-soon* patterns from being unregistered during REST pattern listing (restrict_patterns).
• Exempts woocommerce/coming-soon* patterns from being unregistered during late init cleanup (remove_registered_patterns).

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