Breaking: #77934 - Remove field select_key from content element preview

See Issue #77934

Description

The value of the field select_key has been shown in the preview of a content element in the page module. This field has been removed and therefore also the preview has been removed.

Impact

The preview of this field is not available anymore.

Affected Installations

Every installation or third party extension which uses the field.

Migration

No migration available.