Fix source in DCR data model

[Jakeii]

What is the value of this and can you measure success?

At the moment this property is always an empty string for newer video pages using youtube.

This fix will allow showing the source of the media on DCR rendered video pages which use the youtube atom.

This is the source from frontend rendered page that we need to render in DCR

What does this change?

elements.videos appears to be where the media elements are on old non-youtube video articles like https://www.theguardian.com/film/video/2013/aug/14/chloe-grace-moretz-kick-ass-2-video

For newer aticles like https://www.theguardian.com/global/video/2024/apr/25/160-pilot-whales-stranded-and-26-confirmed-dead-in-western-australia-video it's in content.media, using the first item in it seems logical.

Screenshots

Before	After

Checklist

• Tested locally, and on CODE if necessary
• Will not break dotcom-rendering
• Will not break our database – if updating CAPI, updated and committed the database files
• Meets our accessibility standards
  • Tested with screen reader
  • Navigable with keyboard
  • Colour contrast passed

[github-actions]

Deploy build 1689 of dotcom:frontend-all to CODE

All deployment options

• Deploy build 1689 of dotcom:frontend-all to CODE
• Deploy parts of build 1689 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[prout-bot]

Seen on FRONTS-PROD, ADMIN-PROD (merged by @Jakeii 52 minutes and 32 seconds ago)

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