Fix deny_all_requests_except_allowed of AddressableUrlValidator

Furkan Ayhanrequested to merge
backport-16-9-fix-deny_all_requests_except_allowed-for-urlblocker into 16-9-stable-ee

What does this MR do and why?

This is a backport of !144488 (merged) to 16-9-stable-ee.

ref https://gitlab.com/gitlab-org/gitlab/-/issues/440842#note_1776821184

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Edited by Furkan Ayhan

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