Remove legacy Admin UI for image field types

[timleslie]

See #5025.

Second in the series to remove legacy Admin UI views from field types.

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🦋 Changeset detected

Latest commit: cd8b408

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@keystone-next/fields-cloudinary-image-legacy	Major
@keystone-next/fields-oembed-legacy	Major
@keystone-next/fields-unsplash-legacy	Major
@keystone-next/cloudinary	Patch

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