Werk #17345: Remove automation user login via HTTP parameters

Component	Setup
Title	Remove automation user login via HTTP parameters
Date	Mar 7, 2025
Level	Trivial Change
Class	New Feature
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

As announced with Werk #16223 and #17147 authentication via the _username/_secret parameters for automation users was removed.

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