VideoPress: dont allow editing video data when doesn't belong to site

[retrofox]

This PR disables the title and description fields of the Details panel when the video doesn't belong to the site.
Follow-up PR will add a Notice and probably a modal explaining the limitations when creating a block instance by using a video that doesn't belong to the site.

Fixes #
Part of #30417

Proposed changes:

• VideoPress: dont allow editing video data when the video doesn't belong to the site

Other information:

• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• Go to the block editor

• Create/edit a VideoPress video instance

• Set title and description

• Confirm it works as expected

• Create another VideoPress video block that doesn't belong to the site (https://videopress.com/v/NGYE1Hqy)

• Confirm title and description fields are disabled.

Screen.Recording.2023-05-03.at.16.17.19.mov

[github-actions]

Are you an Automattician? You can now test your Pull Request on WordPress.com. On your sandbox, run

bin/jetpack-downloader test jetpack update/videopress-propagate-belong-to-to-client-side

to get started. More details: p9dueE-5Nn-p2

[github-actions]

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[dhasilva]

Tested on wpcom, WoA and JN. Working as expected. Nice work!