Quick Answers: Update fieldtrial for Finch

Bug: 1129655
Change-Id: I64071441ebd50462e976e651d948cf29e197cd65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567483Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832553}

testing/variations/fieldtrial_testing_config.json

@@ -5708,10 +5708,16 @@
             "experiments": [
                 {
                     "name": "Enabled",
+                    "params": {
+                        "selected_text_confidence_threshold": "0.7",
+                        "surrounding_text_confidence_threshold": "0.9"
+                    },
                     "enable_features": [
                         "QuickAnswers",
                         "QuickAnswersRichUi",
-                        "QuickAnswersTextAnnotator"
+                        "QuickAnswersTextAnnotator",
+                        "QuickAnswersTranslation",
+                        "QuickAnswersTranslationCloudAPI"
                     ]
                 }
             ]