Authentication via URL Parameters no longer supported

[dbauer23]

• Problem: The Multisite API currently relies on authentication via GET URL parameters, which is now disabled by default in Checkmk 2.4.0.
• Impact: This breaks compatibility with existing scripts or tools that depend on this method for automation.
• Workaround: Enable "Automation user authentication via HTTP parameters" in Global Settings

🔗 References:

• Werk #16223
• Checkmk 2.4 Major Upgrade Notes – Automation Login

I may be able to provide a PR later today.