Revert Skip DNS rebinding checks if HTTP_PROXY
What does this MR do and why?
This reverts !110842 (merged). The revert involved resolving a conflict in url_blocker.rb after the small refactor in !113035 (merged).
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #393164 (closed)
Edited by Luke Duncalfe