Add benchmarks

Signed-off-by: SungJin1212 <[email protected]>

Author: SungJin1212

pkg/util/push/push_test.go

@@ -532,4 +532,4 @@ func createCortexWriteRequestProtobuf(t *testing.T, skipLabelNameValidation bool
 	inoutBytes, err := input.Marshal()
 	require.NoError(t, err)
 	return inoutBytes
-}
+}