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Revert "Add dummy "/preconnect" URL endpoint on restbase varnishes"

Description

Revert "Add dummy "/preconnect" URL endpoint on restbase varnishes"

This is no longer needed, as VisualEditor now loads the content
from the /api/rest_v1/ entry point at the main project domain.

This reverts commit 1e85b195b68190ad36a00c7fca78aeb6b68d8a16.

Bug: T97500
Change-Id: Ic293cd4d9edcabf433461d0096f0d9a8c0eb6506