Issue #3615498: Remove Messenger usage from API request handling

Sergey Drakrequested to merge
issue/myrest-3615498:3615498-bug-remove-messenger into 1.0.x

The module's single messenger call becomes a notice on the myrest logger channel, and the argument is gone from the service definition.

The call did not fire on API requests - it sits behind a check for an _entity_form route ending in /add - but the subscriber serves both the API redirects and that admin redirect from one class, so only that branch condition stood between an API request and a message queued into a session. The redirect is unchanged; the user-facing explanation is now in the log instead.

Co-Authored-By: Claude Opus 5 noreply@anthropic.com

Closes #3615498

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