les, light: remove untrusted header retrieval in ODR (#21907)

* les, light: remove untrusted header retrieval in ODR

* les: polish

* light: check the hash equality in odr

les/retrieve.go

@@ -155,6 +155,15 @@ func (rm *retrieveManager) sendReq(reqID uint64, req *distReq, val validatorFunc
 	return r
 }
 
+// requested reports whether the request with given reqid is sent by the retriever.
+func (rm *retrieveManager) requested(reqId uint64) bool {
+	rm.lock.RLock()
+	defer rm.lock.RUnlock()
+
+	_, ok := rm.sentReqs[reqId]
+	return ok
+}
+
 // deliver is called by the LES protocol manager to deliver reply messages to waiting requests
 func (rm *retrieveManager) deliver(peer distPeer, msg *Msg) error {
 	rm.lock.RLock()