Remove extra tags which aren't needed

I was using Zipkin and some useful flags were missing, but when using
Jaeger they're present, so I didn't actually need to set these
explicitly.

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

@@ -111,8 +111,8 @@ def set_trailing_metadata(self, *args, **kwargs):
         return self._servicer_context.set_trailing_metadata(*args, **kwargs)
 
     def abort(self, code, details):
-        self._active_span.set_attribute("rpc.status_code", code.name)
-        self._active_span.set_attribute("rpc.details", details)
+        self.code = code
+        self.details = details
         self._active_span.set_status(
             Status(
                 canonical_code=StatusCanonicalCode(code.value[0]),
@@ -128,7 +128,6 @@ 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(
                 canonical_code=StatusCanonicalCode(code.value[0]),
@@ -139,7 +138,6 @@ def set_code(self, code):
 
     def set_details(self, details):
         self.details = details
-        self._active_span.set_attribute("rpc.details", details)
         self._active_span.set_status(
             Status(
                 canonical_code=StatusCanonicalCode(self.code.value[0]),