Mark hybrid tests as flaky

Makefile

@@ -1894,8 +1894,6 @@ test_cxx: buildtests_cxx
 	$(Q) $(BINDIR)/$(CONFIG)/grpclb_api_test || ( echo test grpclb_api_test failed ; exit 1 )
 	$(E) "[RUN]     Testing grpclb_test"
 	$(Q) $(BINDIR)/$(CONFIG)/grpclb_test || ( echo test grpclb_test failed ; exit 1 )
-	$(E) "[RUN]     Testing hybrid_end2end_test"
-	$(Q) $(BINDIR)/$(CONFIG)/hybrid_end2end_test || ( echo test hybrid_end2end_test failed ; exit 1 )
 	$(E) "[RUN]     Testing interop_test"
 	$(Q) $(BINDIR)/$(CONFIG)/interop_test || ( echo test interop_test failed ; exit 1 )
 	$(E) "[RUN]     Testing mock_test"
@@ -1931,6 +1929,8 @@ test_cxx: buildtests_cxx
 
 
 flaky_test_cxx: buildtests_cxx
+	$(E) "[RUN]     Testing hybrid_end2end_test"
+	$(Q) $(BINDIR)/$(CONFIG)/hybrid_end2end_test || ( echo test hybrid_end2end_test failed ; exit 1 )
 
 
 test_python: static_c

build.yaml

@@ -3287,7 +3287,7 @@ targets:
   - linux
   - posix
 - name: hybrid_end2end_test
-  gtest: true
+  flaky: true
   build: test
   language: c++
   src:

tools/run_tests/generated/tests.json

@@ -2856,8 +2856,8 @@
     "cpu_cost": 1.0, 
     "exclude_configs": [], 
     "exclude_iomgrs": [], 
-    "flaky": false, 
-    "gtest": true, 
+    "flaky": true, 
+    "gtest": false, 
     "language": "c++", 
     "name": "hybrid_end2end_test", 
     "platforms": [