[Stream] Adding origin restrictions for media transformations

[tsmith512]

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PR Change Summary

Introduced origin restrictions for media transformations to enhance control over source usage.

• Added source origin restrictions for media transformations.
• Default setting restricts transformations to the same domain.
• Provided guidance on enabling additional sources in the Cloudflare dashboard.

Added Files

• src/content/changelog/stream/2025-05-14-media-transformations-origin-restrictions.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/changelog/	@cloudflare/pm-changelogs, @cloudflare/pcx-cloudflare-one

[github-actions]

Preview URL: https://1157a8d3.preview.developers.cloudflare.com
Preview Branch URL: https://tsmith-stream-20250414.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/changelog/2025-05-14-media-transformations-origin-restrictions/	https://tsmith-stream-20250414.preview.developers.cloudflare.com/changelog/2025-05-14-media-transformations-origin-restrictions/