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

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

@@ -1,5 +1,65 @@
 {
   "data": [
+    {
+      "schemaVersion": "1.12.0",
+      "slug": "android-default-toolbar-placement",
+      "id": "android-default-toolbar-placement",
+      "arguments": {},
+      "application": "org.mozilla.firefox",
+      "appName": "fenix",
+      "appId": "org.mozilla.firefox",
+      "channel": "release",
+      "userFacingName": "Android default toolbar placement",
+      "userFacingDescription": "Testing default position of toolbar.",
+      "isEnrollmentPaused": false,
+      "isRollout": false,
+      "bucketConfig": {
+        "randomizationUnit": "nimbus_id",
+        "namespace": "fenix-toolbar-release-1",
+        "start": 0,
+        "count": 8800,
+        "total": 10000
+      },
+      "featureIds": [
+        "toolbar"
+      ],
+      "probeSets": [],
+      "outcomes": [],
+      "branches": [
+        {
+          "slug": "control",
+          "ratio": 1,
+          "feature": {
+            "featureId": "toolbar",
+            "enabled": true,
+            "value": {
+              "toolbar-position-top": false
+            }
+          }
+        },
+        {
+          "slug": "treatment-a",
+          "ratio": 1,
+          "feature": {
+            "featureId": "toolbar",
+            "enabled": true,
+            "value": {
+              "toolbar-position-top": true
+            }
+          }
+        }
+      ],
+      "targeting": "((is_already_enrolled) || ((isFirstRun == 'true') && (app_version|versionCompare('115.!') >= 0)))",
+      "startDate": "2023-06-26",
+      "enrollmentEndDate": "2023-07-12",
+      "endDate": null,
+      "proposedDuration": 36,
+      "proposedEnrollment": 8,
+      "referenceBranch": "control",
+      "featureValidationOptOut": false,
+      "localizations": null,
+      "locales": null
+    },
     {
       "schemaVersion": "1.12.0",
       "slug": "android-re-engagement-notifications-timing",