Fix: user request issue

[up1512001]

What

• due to missing trailingslash into shared sites url's were not matching and request was not reaching to brand site.

Related Issue(s):

Part of https://github.com/rtCamp/OnePress/issues/58

Checklist

• I have read the Contribution Guidelines.
• I have read the Development Guidelines.
• My code is tested to the best of my abilities.
• My code passes all lints (ESLint etc.).
• My code has detailed inline documentation.
• I have updated the project documentation as needed.

[Copilot]

Pull request overview

This PR fixes a URL matching issue where missing trailing slashes prevented requests from properly reaching brand sites. The fix normalizes URLs by removing trailing slashes before lookup operations.

• Normalizes site URLs using untrailingslashit() before looking up in the shared sites array
• Adds error logging for duplicate or invalid sites in update_user_roles_for_sites
• Includes user data in the error response when an email already exists during user creation

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