[Challenges] fix cf-clearance

[patriciasantaana]

Summary

cf-clearance to cf_clearance
closes #23585

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Updated references from cf-clearance to cf_clearance throughout the documentation to ensure consistency and accuracy.

• Changed all instances of cf-clearance to cf_clearance in the documentation.
• Updated related explanations to reflect the new cookie naming convention.

Modified Files

• src/content/docs/cloudflare-challenges/concepts/clearance.mdx
• src/content/docs/turnstile/turnstile-analytics/challenge-outcomes.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/cloudflare-challenges/	@patriciasantaana, @cloudflare/pcx-technical-writing
/src/content/docs/turnstile/	@migueldemoura, @punkeel, @worenga, @patriciasantaana, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://415a5e23.preview.developers.cloudflare.com
Preview Branch URL: https://patricia-pcx-cf-clearance.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-challenges/concepts/clearance/	https://patricia-pcx-cf-clearance.preview.developers.cloudflare.com/cloudflare-challenges/concepts/clearance/
https://developers.cloudflare.com/turnstile/turnstile-analytics/challenge-outcomes/	https://patricia-pcx-cf-clearance.preview.developers.cloudflare.com/turnstile/turnstile-analytics/challenge-outcomes/