fix(clerk-js): Do not use CF proxy as fallback for challenges.cloudflare.com #11716

Job	Run time
check-permissions	1s
Formatting, linting & changeset checks	1m 57s
Unit Tests (18)	53s
Integration Tests (generic, chrome)	3m 59s
Unit Tests (22)	1m 30s
Integration Tests (express, chrome)	2m 7s
Integration Tests (quickstart, chrome)	2m 25s
Integration Tests (ap-flows, chrome)	2m 47s
Integration Tests (elements, chrome)	2m 56s
Integration Tests (sessions, chrome)	3m 51s
Integration Tests (astro, chrome)	3m 30s
Integration Tests (expo-web, chrome)	2m 33s
Integration Tests (tanstack-start, chrome)	3m 50s
Integration Tests (tanstack-router, chrome)	2m 10s
Integration Tests (vue, chrome)	2m 8s
Integration Tests (nuxt, chrome)	2m 52s
Integration Tests (react-router, chrome)	2m 22s
Integration Tests (nextjs, chrome, 13)	5m 32s
Integration Tests (nextjs, chrome, 14)	5m 30s
Integration Tests (nextjs, chrome, 15)	5m 29s
	58m 22s

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