[ci] Add google_adsense to 9_first_party_packages.yml (#159827)

Adds the google_adsense package to the list of 1P packages in the
"9_first_party_packages.yaml" file.

## Issues

Related: https://github.com/flutter/packages/pull/6871

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.github/ISSUE_TEMPLATE/9_first_party_packages.yml

@@ -45,6 +45,7 @@ body:
         - flutter_template_images
         - go_router
         - go_router_builder
+        - google_adsense
         - google_identity_services_web
         - google_maps_flutter
         - google_sign_in