Introduce a CONFLICT error detail catered for mutations. #696
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Indicates the operation conflicts with the current state of the target resource.
Conflicts are most likely to occur in the context of a mutation.
For example, you may get a CONFLICT when writing a field with a reference value that is
older than the one already on the server, resulting in a version control conflict.
HTTP Mapping: 409 Conflict.
Error Type: FAILED_PRECONDITION