Update fieldtrial testing config for NTPSnippets

testing/variations/fieldtrial_testing_config.json

 {
     "AllBookmarks": [
         {
             "platforms": [
                 "android"
             ],
             "experiments": [
                 {
                     "name": "Disabled",
                     "disable_features": [
@@ skipping 881 matching lines @@
     ],
     "NTPSnippets": [
         {
             "platforms": [
                 "android"
             ],
             "experiments": [
                 {
                     "name": "Enabled",
                     "enable_features": [
+                        "NTPArticleSuggestions",
+                        "NTPBookmarkSuggestions",
                         "NTPSnippets"
                     ]
                 }
             ]
         }
     ],
     "NetworkQualityEstimator": [
         {
             "platforms": [
                 "android",
@@ skipping 1283 matching lines @@
                 {
                     "name": "Enabled",
                     "enable_features": [
                         "use-new-media-cache"
                     ]
                 }
             ]
         }
     ]
 }