refactor: use opentelemetry's standard api to track http status code (#2760)

rest/handler/tracinghandler_test.go

@@ -148,46 +148,3 @@ func TestTraceResponseWriter(t *testing.T) {
 		})
 	}
 }
-
-func TestTraceHandler_traceResponseWriter(t *testing.T) {
-	writer := &traceResponseWriter{
-		w: httptest.NewRecorder(),
-	}
-	assert.NotPanics(t, func() {
-		writer.Hijack()
-	})
-
-	writer = &traceResponseWriter{
-		w: mockedHijackable{httptest.NewRecorder()},
-	}
-	assert.NotPanics(t, func() {
-		writer.Hijack()
-	})
-
-	writer = &traceResponseWriter{
-		w: httptest.NewRecorder(),
-	}
-	writer.WriteHeader(http.StatusBadRequest)
-	assert.NotNil(t, writer.Header())
-
-	writer = &traceResponseWriter{
-		w: httptest.NewRecorder(),
-	}
-	assert.NotPanics(t, func() {
-		writer.Flush()
-	})
-
-	writer = &traceResponseWriter{
-		w: mockedFlusher{httptest.NewRecorder()},
-	}
-	assert.NotPanics(t, func() {
-		writer.Flush()
-	})
-}
-
-type mockedFlusher struct {
-	*httptest.ResponseRecorder
-}
-
-func (m mockedFlusher) Flush() {
-}