Backport of Update iframe to VideoEmbed into v0.15

[github-actions]

Backport

This PR is auto-generated from #36943 to be assessed for backporting due to the inclusion of the label 0.15-backport.

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@im2nguyen
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merge conflict error: POST https://api.github.com/repos/hashicorp/terraform/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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This updates the existing iframe for youtube to a VideoEmbed component. This is so we can standardize how we are serving and tracking video plays across DevDot.

Related PR: hashicorp/dev-portal#2699

Fixes #

Target Release

1.13.x

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

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Overview of commits

• 1af5cfc

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1 out of 2 committers have signed the CLA.

• im2nguyen
• temp

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[radeksimko]

The old branches (<= 0.15) are now locked so I think this will need to be addressed after the docs migration when the content is outside of this repository.

[github-actions]

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