Update Fenix initial_experiments.json based on the current first-run experiments in experimenter

(cherry picked from commit 683843f83e9fdfd5ff00b32a175824ff19ae298b)

app/src/main/res/raw/initial_experiments.json

@@ -131,6 +131,67 @@
       "localizations": null,
       "locales": null
     },
+    {
+      "schemaVersion": "1.12.0",
+      "slug": "beta-android-onboarding-redesign-treatment-a-rollout",
+      "id": "beta-android-onboarding-redesign-treatment-a-rollout",
+      "arguments": {},
+      "application": "org.mozilla.firefox_beta",
+      "appName": "fenix",
+      "appId": "org.mozilla.firefox_beta",
+      "channel": "beta",
+      "userFacingName": "Beta Android Onboarding Redesign - Treatment A Rollout",
+      "userFacingDescription": "Testing a new onboarding experience.",
+      "isEnrollmentPaused": false,
+      "isRollout": true,
+      "bucketConfig": {
+        "randomizationUnit": "nimbus_id",
+        "namespace": "fenix-juno-onboarding-beta-mobile_first_run-rollout-1",
+        "start": 0,
+        "count": 10000,
+        "total": 10000
+      },
+      "featureIds": [
+        "juno-onboarding"
+      ],
+      "probeSets": [],
+      "outcomes": [
+        {
+          "slug": "default-browser",
+          "priority": "primary"
+        }
+      ],
+      "branches": [
+        {
+          "slug": "treatment-a",
+          "ratio": 1,
+          "feature": {
+            "featureId": "this-is-included-for-mobile-pre-96-support",
+            "enabled": false,
+            "value": {}
+          },
+          "features": [
+            {
+              "featureId": "juno-onboarding",
+              "enabled": true,
+              "value": {
+                "enabled": true
+              }
+            }
+          ]
+        }
+      ],
+      "targeting": "((is_already_enrolled) || ((isFirstRun == 'true') && (app_version|versionCompare('118.!') >= 0)))",
+      "startDate": "2023-09-06",
+      "enrollmentEndDate": "2023-09-11",
+      "endDate": null,
+      "proposedDuration": 28,
+      "proposedEnrollment": 7,
+      "referenceBranch": "treatment-a",
+      "featureValidationOptOut": false,
+      "localizations": null,
+      "locales": null
+    },
     {
       "schemaVersion": "1.12.0",
       "slug": "felt-privacy-android",