ci: exclude aio/ from build-and-ci pullapprove group

the aio/ has a separate build and ci setup that doesn't affect main repo, so it doesn't make
sense for the build-and-ci group to approve changes to that separate setup.

.pullapprove.yml

@@ -64,6 +64,7 @@ groups:
         exclude:
           - "tools/@angular/tsc-wrapped/*"
           - "tools/public_api_guard/*"
+          - "aio/*"
     users:
       - IgorMinar #primary
       - mhevery