fix(e2e): add yarn-berry package to E2E examples

The E2E tests were failing with "yarn: command not found" because
nodejs@20 only includes npm. Added yarn-berry@latest to both
E2E-compat and E2E-latest devbox.json packages lists since the
scripts use yarn commands.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: abueide

examples/E2E-compat/devbox.json

@@ -2,7 +2,13 @@
   "include": [
     "github:segment-integrations/mobile-devtools?dir=plugins/react-native"
   ],
-  "packages": ["nodejs@20", "watchman@latest", "jdk17@latest", "gradle@latest"],
+  "packages": [
+    "nodejs@20",
+    "yarn-berry@latest",
+    "watchman@latest",
+    "jdk17@latest",
+    "gradle@latest"
+  ],
   "env": {
     "IOS_APP_SCHEME": "AnalyticsReactNativeE2E",
     "IOS_APP_BUNDLE_ID": "com.analyticsreactnativeexample",

examples/E2E-latest/devbox.json

@@ -2,7 +2,13 @@
   "include": [
     "github:segment-integrations/mobile-devtools?dir=plugins/react-native"
   ],
-  "packages": ["nodejs@20", "watchman@latest", "jdk17@latest", "gradle@latest"],
+  "packages": [
+    "nodejs@20",
+    "yarn-berry@latest",
+    "watchman@latest",
+    "jdk17@latest",
+    "gradle@latest"
+  ],
   "env": {
     "IOS_APP_SCHEME": "AnalyticsReactNativeE2E",
     "IOS_APP_BUNDLE_ID": "com.analyticsreactnativeexample",