Add referrerPolicy to Vimeo Video iframe to allow domain-restricted videos

[davefarthing]

Description

When Vimeo videos are domain restricted, (see Vimeo ) they require that the video iFrame passes a referrer header. This is missing from the existing implementation and domain restricted videos will not play.

Setting the referrerPolicy (MDN) the iFrame correctly sends the referrer header with the video request.

Fixed Issues (if relevant)

n/a

Manual testing scenarios

1. Embedd a domain restricted Vimeo video against a product.
2. Check the video displays correctly on the frontend

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

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