Revert "use read lock when building endpoints from shards (#36657)" (#36659)
Revert "use read lock when building endpoints from shards (#36657)" (#36659)

This reverts commit c151f81ab7e0934269ad660b49bb2f1317ef55fa.
istio/istio,istio/istio,istio/istio,istio/istio,istio/istio