add a few flaky tags in transition_test.js

Author: etpinard

test/jasmine/tests/transition_test.js

@@ -639,7 +639,7 @@ describe('Plotly.react transitions:', function() {
         .then(done);
     });
 
-    it('should only transition the layout when both traces and layout have animatable changes by default', function(done) {
+    it('@flaky should only transition the layout when both traces and layout have animatable changes by default', function(done) {
         var data = [{y: [1, 2, 1]}];
         var layout = {
             transition: {duration: 10},
@@ -799,7 +799,7 @@ describe('Plotly.react transitions:', function() {
         .then(done);
     });
 
-    it('should transition layout when one or more axis auto-ranged value changed', function(done) {
+    it('@flaky should transition layout when one or more axis auto-ranged value changed', function(done) {
         var data = [{y: [1, 2, 1]}];
         var layout = {transition: {duration: 10}};
 
@@ -850,7 +850,7 @@ describe('Plotly.react transitions:', function() {
         .then(done);
     });
 
-    it('should not transition layout when axis auto-ranged value do not changed', function(done) {
+    it('@flaky should not transition layout when axis auto-ranged value do not changed', function(done) {
         var data = [{y: [1, 2, 1]}];
         var layout = {transition: {duration: 10}};