[Firebase AI] Use build-for-testing and test-without-building

Author: andrewheard

scripts/build.sh

@@ -518,7 +518,7 @@ case "$product-$platform-$method" in
       -project 'FirebaseAI/Tests/TestApp/FirebaseAITestApp.xcodeproj' \
       -scheme "FirebaseAITestApp-SPM" \
       "${xcb_flags[@]}" \
-      build
+      build-for-testing
 
     # Run tests
     RunXcodebuild \
@@ -528,7 +528,7 @@ case "$product-$platform-$method" in
       -parallel-testing-enabled NO \
       -retry-tests-on-failure \
       -test-iterations 3 \
-      test
+      test-without-building
     ;;
 
   Sessions-*-integration)