Adding warning about re-accessing request.formData() in all relevant places

[Oxyjun]

Summary

The body of a Request can only be accessed once. This is explained in the warning note here:

Previously, this warning note was only present in a single page in R2. Now, this PR adds the warning note in all places where we show a code snippet which uses request.formData(), so that a user is aware of it (in case they use the code snippet as a springboard to create new code).

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Enhanced documentation by adding a warning about the single access limitation of request.formData() across multiple relevant pages.

• Added a cautionary note regarding the single access limitation of request.formData() in multiple documentation pages.
• Introduced a new partial for the warning note to maintain consistency across the documentation.
• Updated various tutorials and guides to include the new warning for better user awareness.

Modified Files

• src/content/docs/images/tutorials/optimize-user-uploaded-image.mdx
• src/content/docs/pages/functions/plugins/hcaptcha.mdx
• src/content/docs/pages/functions/plugins/index.mdx
• src/content/docs/pages/functions/plugins/turnstile.mdx
• src/content/docs/pages/how-to/refactor-a-worker-to-pages-functions.mdx
• src/content/docs/pages/tutorials/forms/index.mdx
• src/content/docs/r2/api/workers/workers-api-usage.mdx
• src/content/docs/r2/tutorials/summarize-pdf.mdx
• src/content/docs/turnstile/tutorials/implicit-vs-explicit-rendering.mdx
• src/content/docs/workers/examples/read-post.mdx
• src/content/docs/workers/examples/turnstile-html-rewriter.mdx
• src/content/docs/workers/tutorials/handle-form-submissions-with-airtable/index.mdx

Added Files

• src/content/partials/workers/request-dot-clone-warning.mdx

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[github-actions]

Preview URL: https://d3f98258.preview.developers.cloudflare.com
Preview Branch URL: https://jun-workers-request-clone-partial.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/api/workers/workers-api-usage/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/r2/api/workers/workers-api-usage/
https://developers.cloudflare.com/workers/examples/read-post/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/workers/examples/read-post/
https://developers.cloudflare.com/images/tutorials/optimize-user-uploaded-image/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/images/tutorials/optimize-user-uploaded-image/
https://developers.cloudflare.com/pages/functions/plugins/hcaptcha/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/pages/functions/plugins/hcaptcha/
https://developers.cloudflare.com/pages/functions/plugins/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/pages/functions/plugins/
https://developers.cloudflare.com/pages/functions/plugins/turnstile/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/pages/functions/plugins/turnstile/
https://developers.cloudflare.com/pages/how-to/refactor-a-worker-to-pages-functions/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/pages/how-to/refactor-a-worker-to-pages-functions/
https://developers.cloudflare.com/pages/tutorials/forms/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/pages/tutorials/forms/
https://developers.cloudflare.com/turnstile/tutorials/implicit-vs-explicit-rendering/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/turnstile/tutorials/implicit-vs-explicit-rendering/
https://developers.cloudflare.com/workers/examples/turnstile-html-rewriter/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/workers/examples/turnstile-html-rewriter/
https://developers.cloudflare.com/r2/tutorials/summarize-pdf/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/r2/tutorials/summarize-pdf/
https://developers.cloudflare.com/workers/tutorials/handle-form-submissions-with-airtable/	https://jun-workers-request-clone-partial.preview.developers.cloudflare.com/workers/tutorials/handle-form-submissions-with-airtable/

[GregBrimble]

Correction: #22025