Rework gRPC status based on new rules

As of open-telemetry#1214, the status codes changed and no longer line up with gRPC
status codes, so now we'll just set `StatusCode.ERROR` and store the
actual gRPC status code in the trace as `grpc.status_code`.

instrumentation/opentelemetry-instrumentation-grpc/src/opentelemetry/instrumentation/grpc/_server.py

@@ -113,8 +113,9 @@ def set_trailing_metadata(self, *args, **kwargs):
  def abort(self, code, details):
  self.code = code
  self.details = details
+ self._active_span.set_attribute("rpc.status_code", code.name)
  self._active_span.set_status(
- Status(status_code=StatusCode(code.value[0]), description=details)
+ Status(status_code=StatusCode.ERROR, description=details)
  )
  return self._servicer_context.abort(code, details)
 
@@ -125,18 +126,16 @@ def set_code(self, code):
  self.code = code
  # use details if we already have it, otherwise the status description
  details = self.details or code.value[1]
+ self._active_span.set_attribute("rpc.status_code", code.name)
  self._active_span.set_status(
- Status(status_code=StatusCode(code.value[0]), description=details)
+ Status(status_code=StatusCode.ERROR, description=details)
  )
  return self._servicer_context.set_code(code)
 
  def set_details(self, details):
  self.details = details
  self._active_span.set_status(
- Status(
- status_code=StatusCode(self.code.value[0]),
- description=details,
- )
+ Status(status_code=StatusCode.ERROR, description=details)
  )
  return self._servicer_context.set_details(details)