GEODE-4403: Remove ProtobufErrorCode

[galen-pivotal]

as it's a duplicate of BasicTypes.ErrorCode

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[PivotalSarge]

LGTM

[WireBaron]

Change looks good, if you want the super bonus extra credit, you could change the Failure.of() signature to take an ErrorCode and string and then build the appropriate response rather than having all of this builder code out there everywhere return an error.

[galen-pivotal]

Rebased on develop, will merge if tests pass.