fix(ecstore): send valid ping body in remote locker (#3112)

* fix(ecstore): send valid ping body in remote locker

Build ping requests with a flatbuffer payload so health checks remain compatible with the ping response parser after restart.

* fix(bench): use multi-host warp target during failover

Normalize comma-separated warp host lists in run_object_batch_bench and let four-node failover bench pass BENCH_WARP_HOSTS so rolling restart does not pin load to a single restarting node.

* feat(health): add compat health probes with busy/KMS checks

  - Add /health/live liveness probe endpoint
  - Add busy protection (429) for readiness probes, gated by RUSTFS_HEALTH_COMPAT_BUSY_CHECK_ENABLE
  - Add KMS readiness check for /health/ready, gated by RUSTFS_HEALTH_COMPAT_KMS_READY_CHECK_ENABLE
  - Add lock quorum status caching with TTL to reduce RPC pressure
  - Consolidate health response building into build_health_response_parts
  - Register /health/live in console router and readiness gate
  - Remove MinIO references from newly added health code

* fix(health): decouple kms readiness from lock quorum

scripts/run_object_batch_bench.sh

@@ -108,12 +108,28 @@ print_dry_run_command() {
 
 normalize_warp_host() {
   local raw="$1"
-  raw="${raw#http://}"
-  raw="${raw#https://}"
-  raw="${raw%%/*}"
-  raw="${raw%%\?*}"
-  raw="${raw%%\#*}"
-  echo "$raw"
+  local item normalized
+  local -a parts
+  local -a hosts=()
+
+  IFS=',' read -r -a parts <<< "$raw"
+  for item in "${parts[@]}"; do
+    item="$(echo "$item" | xargs)"
+    [[ -z "$item" ]] && continue
+    item="${item#http://}"
+    item="${item#https://}"
+    item="${item%%/*}"
+    item="${item%%\?*}"
+    item="${item%%\#*}"
+    [[ -n "$item" ]] && hosts+=("$item")
+  done
+
+  if [[ ${#hosts[@]} -eq 0 ]]; then
+    return 0
+  fi
+
+  normalized="$(IFS=','; echo "${hosts[*]}")"
+  echo "$normalized"
 }
 
 parse_args() {