Block Directory: Update the regular expression that determines whether the plugin is using an img URL or an icon slug.

[StevenDufresne]

Description

The block directory API returns either an icon slug or a URL for the plugin's icon. This PR changes the regular expression to allow for an optional query string after the image URL. A detailed explanation of the issue can be found here: #19264 .

Fixes: #19264

How has this been tested?

Unit tests have been added to test this change.

Currently testing 3 cases:

• icon: https://ps.w.org/listicles/assets/icon-128x128.png ✅
• icon: https://ps.w.org/listicles/assets/icon-128x128.png?rev=2011672&test=234234 ✅
• icon: block-default ✅

Types of changes

This is a bug fix. The current regular expression does not account for a query string being added by the CDN serving the plugins and its assets. Read more here: #19264

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR. .

[mkaz]

Looks good 👍
Thanks for including the tests, makes it easier to test and confirm