Remove old AdMob quickstart.

Author: jonsimantov

.github/workflows/android.yml

@@ -32,7 +32,7 @@ jobs:
         if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
           apis="${{ github.event.inputs.apis }}"
         else
-          apis="admob,analytics,auth,database,dynamic_links,firestore,functions,gma,messaging,remote_config,storage"
+          apis="analytics,auth,database,dynamic_links,firestore,functions,gma,messaging,remote_config,storage"
         fi
         echo apis:  ${apis}
         echo "::set-output name=apis::${apis}"