Enable test sparse allreduce basics Windows (#103317)
The test was marked as flaky in #59965. However, it is not failing anymore so it can be enabled.
This PR enables only one test, but it will only run in local tests because the test suite is disabled in CI.
#94495 is a superset of this PR which enables the full test suite. The CI run there shows this test passing.
Fixes #59965
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103317
Approved by: https://github.com/kit1980
