Eliminate a number of calls to asZObject().

Bug: T426332

- allow orchestrate to accept WFBase objects as function call
- do not call asZObject in getEnvelopeFor_ (`orchestrate()` can now handle WFBase)
- add WFKeys method to all WFBase objects, allowing for createZObjectKey to work
- add tests to ensure that many schemata utils work with WFBase
        - isZ(Reference|FunctionCall)
        - findErrorTypeIdentity
        - createZObjectKey
Edited by Cory Massaro

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