feat(registry action): move relatedActionId, relatedRequestId, relatedObjectId fields to relatedEntity list field

Also add empty string validation for related objects in leaseAction and leaseRequest

BREAKING CHANGE: relatedActionId, relatedRequestId, relatedObjectId fields now filled as list of objects with id and entity type as variables

Related: #86 (closed)

Edited by Viacheslav Sukhovieiev

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