make createLayoutRequestDTO' fields required

[vferraro-scottlogic]

Background

Currently nothing is stopping us from sending a request which omits all the fields in metadata

Work Required

• all fields in metadata to be required except for screenshot (might have to create a new Dto if the current one is also used for updates)

[cfisher-scottlogic]

might have to create a new Dto if the current one is also used for updates

Why would updates not have the same constraints?

[vferraro-scottlogic]

might have to create a new Dto if the current one is also used for updates

Why would updates not have the same constraints?

Actually yes. You can ignore that comment. We had a separate ticket for reworking the layout updates (either always send the whole entity or change to PATCH) and this will address that too.

[pling-scottlogic]

Testing in Postman, the API changes seem fine. There is a general bug with the remote implementation (#131) that is stopping me from testing from the UI.