Changes to Get dal attestation rewards

removed Operation from the items response property allOf list for the response status 200

the response property items/allOf[subschema #2 -> subschema #1]/baker became required for the status 200

the response property items/allOf[subschema #2 -> subschema #1]/baker/oneOf[#/components/schemas/Alias]/address became required for the status 200

the response property items/allOf[subschema #2 -> subschema #1]/block became required for the status 200

endpoint added