ci: run s3-go-tests on remote_storage changes (#12043)

The S3 Remote Cache tests exercise the remote-storage S3 client, but the
path filter did not include weed/remote_storage, so a tagging change
there can regress the suite without running it on the PR.

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.github/workflows/s3-go-tests.yml

@@ -4,6 +4,7 @@ on:
   pull_request:
     paths:
       - 'weed/s3api/**'
+      - 'weed/remote_storage/**'
       - 'weed/filer/**'
       - 'weed/server/**'
       - 'test/s3/**'