Follow-up: Replace color names and slugs

[carolinan]

Description
A follow up to #420

Testing Instructions

• Due to its size, it may be easier to review this by commit first.
• Preview templates and patterns and confirm that there are no block validation errors and that the colors are unchanged.

[github-actions]

Preview changes

You can preview these changes by following the link below:

• Preview changes for twentytwentyfive

I will update this comment with the latest preview links as you push more changes to this PR.
⚠️ Note: The preview sites are created using WordPress Playground. You can add content, edit settings, and test the themes as you would on a real site, but please note that changes are not saved between sessions.

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: carolinan <[email protected]>
Co-authored-by: juanfra <[email protected]>
Co-authored-by: jasmussen <[email protected]>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[juanfra]

Thanks Carolina. Looks good to me 👍

[jasmussen]

Did some spot testing, and this is working well for me too:

[jasmussen]

Thank you!