Fix Android staging deploy: build AAB for Release, revert appName

Two changes to fix staging Android deploys via Rock:

1. Pass aab: true to Rock for Release builds. Google Play requires AAB,
   and Fastlane used bundleRelease to produce it. The Rock migration
   inadvertently switched to assembleRelease (APK only). Additionally,
   Fullstory's Gradle plugin relocates the APK from build/outputs to
   build/intermediates, causing Rock's artifact detection to fail.
   Building AAB sidesteps this since Fullstory doesn't relocate bundles.

2. Revert the ineffective appName: 'app' from rock.config.mjs. The
   Mobile-Expensify Android project has no app/ subdirectory (it IS the
   app module), so the RN CLI config validation rejects it and APP_NAME
   stays empty regardless.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: roryabraham

.github/workflows/buildAndroid.yml

@@ -154,6 +154,7 @@ jobs:
           FORCE_NATIVE_BUILD: ${{ inputs.force-native-build == 'true' && github.run_id || '' }}
         with:
           variant: ${{ inputs.variant }}
+          aab: ${{ inputs.variant == 'Release' }}
           sign: true
           re-sign: true
           ad-hoc: ${{ inputs.variant == 'Adhoc' }}

rock.config.mjs

@@ -19,7 +19,7 @@ export default {
     bundler: pluginMetro(),
     platforms: {
         ios: platformIOS({sourceDir: isHybrid ? './Mobile-Expensify/iOS' : './ios'}),
-        android: platformAndroid({sourceDir: isHybrid ? './Mobile-Expensify/Android' : './android', appName: 'app'}),
+        android: platformAndroid({sourceDir: isHybrid ? './Mobile-Expensify/Android' : './android'}),
     },
     fingerprint: {
         env: ['USE_WEB_PROXY', 'PUSHER_DEV_SUFFIX', 'SECURE_NGROK_URL', 'NGROK_URL', 'USE_NGROK', 'FORCE_NATIVE_BUILD'],