!Remove Globally disable auto registration in CI.

This commit is to test auto-registration=off across all platforms. It
will be removed before merging.

Author: hageboeck

.github/workflows/root-ci.yml

@@ -79,6 +79,7 @@ env:
   GLOBAL_OVERRIDES: 'asserts=ON LLVM_ENABLE_ASSERTIONS=ON'
   ROOT_TEST_S3_ACCESS_KEY: ${{ secrets.ROOT_TEST_S3_ACCESS_KEY }}
   ROOT_TEST_S3_SECRET_KEY: ${{ secrets.ROOT_TEST_S3_SECRET_KEY }}
+  ROOT_OBJECT_AUTO_REGISTRATION: 0
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}