chore: add branch triggers for Android and Web in e2e tests pipeline

Author: SelaseKay

.github/workflows/e2e_tests_pipeline.yaml

@@ -15,6 +15,8 @@ on:
       - main
       - firestore-pipelines-dart-api-v2
       - firestore-pipelines-ios
+      - firestore-pipelines-android
+      - firestore-pipelines-web
     paths:
       - 'packages/cloud_firestore/cloud_firestore/pipeline_example/**'
       - 'packages/cloud_firestore/cloud_firestore/lib/**'