Don't run send_repo_dispatch_event job from forks (#25390)

Because the release package workflow completes cleanly, synchronizing
`main` on a fork triggers the `update_bcd-utils_api` workflow. This
produces annoying workflow failure notifications on the fork.

Author: ddbeck

.github/workflows/update_bcd-utils_api.yml

@@ -10,6 +10,7 @@ on:
 jobs:
   send_repo_dispatch_event:
     runs-on: ubuntu-latest
+    if: github.repository == 'mdn/browser-compat-data'
     steps:
       - uses: actions/github-script@v7
         with: