Enhance user magictag

[JoryHogeveen]

Description

Currently the {@user.##} magic tag is quite limited to the WP_User object only. This won't properly support multiple metedata values and also doesn't consider the a possible User Pod. This PR fixes this by fixing two things:

• pods_v() > Proper order of getting user properties or metadata
• pods_evaluate_tag() > If a user Pod exists, it will run the tag through this Pod first.

Related GitHub issue(s)

Fixes #7150

Changelog text for these changes

PR checklist

• [x] I have tested my own code to confirm it works as I intended.
• [x] My code follows the WordPress Coding Standards.
• [x] My code follows the WordPress Inline Documentation Standards.
• [ ] My code includes automated tests for PHP and/or JS (if applicable).