Fix ArmResourcePatch* templates to use the resource directly in request body

[markcowl]

• The ArmResourcePatch* templates do not accommodate resources with a required properties bag. They cause an error 'properties' already exist when passed in a resource with a required properties bag. Need to open this up to allow BrownField resources.

[markcowl]

This covers changes to the source of the payload model for Patch: use the Resource directly in the model instead of applying core templates to create a new (optional, updateable) model.

[markcowl]

est: 5