Icons Registry: Extend search to include label and keywords fields

[manhar-addweb]

What?

Extends get_registered_icons() in WP_Icons_Registry to search
against label and keywords fields in addition to name.

Why?

Currently the search parameter only matches icon names.
Part of SVG Icon API iteration for WordPress 7.1.

Closes #75715

How?

Updated the search logic in get_registered_icons() to check
name, label, and keywords fields using stripos().

Testing Instructions

Updated the search logic in get_registered_icons() to check
name, label, and keywords fields using stripos().

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

Use of AI Tools

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[im3dabasia]

Thank you for the PR, @manhar-addweb. This was actually addressed in #75878, which added search by label and was merged into trunk yesterday. It might be worth checking the latest trunk to see if the issue is already resolved.

[manhar-addweb]

Thank you for the PR, @manhar-addweb. This was actually addressed in #75878, which added search by label and was merged into trunk yesterday. It might be worth checking the latest trunk to see if the issue is already resolved.

Thanks for the review! Closing this in favor of #75878.

[manhar-addweb]

Thanks @im3dabasia

I checked #75878 - it covers label search only.

This PR also adds keywords field search as mentioned
in #75715:
"We could also reference the label field and an
optional keywords field."

I noticed the manifest.php does not have keywords yet.
I can extend this PR to:

1. Add keywords support to manifest.php for core icons
2. Update register() to accept keywords field

Should I proceed with this?