chore: remove redundant Google Services config

[fadi-george]

Description

One Line Summary

Remove the unnecessary Google Services Gradle plugin and Firebase configuration from the Android demo.

Details

Motivation

OneSignal initializes its own named Firebase app, so the demo does not need the Google Services plugin or google-services.json to build the GMS variant or register for push.

Scope

Removes the Google Services plugin setup and demo Firebase configuration. The GMS and Huawei product flavors remain unchanged.

Testing

Manual testing

Ran ./gradlew :app:assembleGmsDebug. Manifest and resource processing completed without Google Services configuration. Compilation later failed on pre-existing JWT API references that are unavailable in the demo default SDK version (5.6.1). No device testing was needed for this build-configuration cleanup.

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

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