Bugfix/block subscribe (#22516)

* use correct operation name

* require enable_rpc_transaction_history flag when enabling block_subscription

Co-authored-by: Zano <segfaultdoctor@protonmail.com>

multinode-demo/bootstrap-validator.sh

@@ -49,6 +49,9 @@ while [[ -n $1 ]]; do
     elif [[ $1 = --enable-rpc-transaction-history ]]; then
       args+=("$1")
       shift
+    elif [[ $1 = --rpc-pubsub-enable-block-subscription ]]; then
+      args+=("$1")
+      shift
     elif [[ $1 = --enable-cpi-and-log-storage ]]; then
       args+=("$1")
       shift