Serialization: enabling GenerateFieldIds breaks empty record serialization

[mnmr]

When enabling the GenerateFieldIds setting, Orleans fails to generate code for records that do not have any explicit [Id] markings (like the EmptyAbstractRecord in the unit tests project).

Orleans should exclude the compiler-generated properties for record types to work around this issue.

[captainsafia]

Triage: @ReubenBond we think this might be expected behavior and not a bug but looking for your clarification here.