ci: exclude ngcc directory from fw-compiler pull-approve rule (#35933)

ngcc has its own pull-approve group

PR Close #35933

.pullapprove.yml

@@ -198,6 +198,10 @@ groups:
           'aio/content/guide/aot-metadata-errors.md',
           'aio/content/guide/template-typecheck.md '
           ])
+      - >
+        not contains_any_globs(files, [
+          'packages/compiler-cli/ngcc/**'
+          ])
     reviewers:
       users:
         - alxhub