[bare-expo] Update app.json as for a separate bare-expo project (#6734)

# Why

This will let us treat `@[username]/bare-expo` as a proper experience, eg. assign push notifications keys to it.

# How

I used this change to make a configuration change described in #6733.

# Test Plan

I don't think this should do any harm. I have used Credentials Manager with `app.json` from this PR (`sdkVersion` wasn't at this time removed) and I achieved what I wanted.

apps/bare-expo/app.json

@@ -3,9 +3,8 @@
   "displayName": "bare-expo",
   "expo": {
     "name": "BareExpo",
-    "slug": "expo-template-bare",
+    "slug": "bare-expo",
     "privacy": "unlisted",
-    "sdkVersion": "34.0.0",
     "version": "1.0.0",
     "platforms": ["ios", "android", "web"],
     "web": {
@@ -16,6 +15,12 @@
         }
       }
     },
+    "android": {
+      "package": "dev.expo.payments",
+    },
+    "ios": {
+      "bundleIdentifier": "dev.expo.Payments"
+    },
     "notification": {
       "serviceWorkerPath": "/expo-service-worker.js",
       "vapidPublicKey": "BNHvR05XkY5LH9GdN0GreLx2wZnK9IwNJGVmo3jujIkFni4of26E3U3fnt9nUrZfM7h0omdIHKM0eshkzTSFOWQ"