studio integration branch `./gradlew --stop`

We think we found where the extra Gradle daemons are coming from; in the meanwhile, it looks like we should be able to just request that they be stopped before the androidx build proceeds

Bug: 201504768
Bug: 205883835
Test: Treehugger runs busytown/androidx-studio-integration-vitals.sh
Change-Id: I39a30f8149a61b21b92d36bfe78e9be849174f86
diff --git a/busytown/impl/build-studio-and-androidx.sh b/busytown/impl/build-studio-and-androidx.sh
index 575e4ff..2aa37c3 100755
--- a/busytown/impl/build-studio-and-androidx.sh
+++ b/busytown/impl/build-studio-and-androidx.sh
@@ -45,6 +45,9 @@
     echo failed to build studio
     return 1
   fi
+
+  # stop any remaining Gradle daemons, b/205883835
+  JAVA_HOME="$STUDIO_DIR/prebuilts/studio/jdk/jdk11/$STUDIO_JDK" $gw -p $TOOLS_DIR --stop
 }
 
 function zipStudio() {