feat: override get_head search request metadata

[lucymtc]

Description of the Change

Yoast does not yoast_head to the WordPress search endpoint.
Yoast is not properly detecting a search page via the get_head function.

These changes fix the SEO title and canonical URL for the search results when requesting to yoast get_head endpoint.
Note: I have installed a fresh instance of WP to test the get_head endpoint for search results and the response matches the home yoast_head. However running WP in wp-env inside of headstartwp the response is 404 for unknown reason.

Closes #537

How to test the Change

Changelog Entry

Added - New feature
Changed - Existing functionality
Deprecated - Soon-to-be removed feature
Removed - Feature
Fixed - Bug fix
Security - Vulnerability

Credits

Props @username, @username2, ...

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[changeset-bot]

🦋 Changeset detected

Latest commit: 366ffab

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@headstartwp/headstartwp	Patch

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Name	Status	Preview	Comments	Updated (UTC)
headstarwp	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 26, 2024 9:16am

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[nicholasio]

Tested and it works fine for single words searches.

It would be great to support pagination.

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[nicholasio]

@lucymtc Can you add a changeset?

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