[Cloudflare Challenges] Add diagnostic collection and WebView guidance to challenge solve troubleshooting

[zeinjaber]

Closes DEE-3759

Updates the Challenge solve issues page to:

• Clarify that Managed Challenge is issued through the same Cloudflare Challenge Platform technology as Turnstile, so Turnstile troubleshooting steps apply.
• Add a Collect diagnostic information section that links to the existing Gathering information for troubleshooting sites guide for HAR and console log collection, including the need to enable Preserve log and Disable cache for challenge-loop investigations.
• Add a WebView and mobile app implementations section linking to the Mobile implementation guide for native-app WebView failures.

This avoids duplicating existing content and standardizes the diagnostics Support asks for when troubleshooting Turnstile and Managed Challenge solve failures.

[cloudflare-docs-bot]

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[migueldemoura]

Let's call this Challenge Pages rather than Managed Challenge

[zeinjaber]

updated