cmd/devp2p: skip ENR field tails properly in nodeset filter (#22565)

In Geth v1.10, we changed the structure of the "les" ENR entry. As a result, the DHT crawler that creates the DNS lists
no longer recognizes the les nodes, which is fixed in this commit. 

* cmd/devp2p: skip ENR field tails properly in nodeset filter
* cmd/devp2p: fix tail decoder for snap as well
* les: fix tail decoding in "eth" ENR entry

les/enr_entry.go

@@ -35,7 +35,7 @@ func (lesEntry) ENRKey() string { return "les" }
 // ethEntry is the "eth" ENR entry. This is redeclared here to avoid depending on package eth.
 type ethEntry struct {
 	ForkID forkid.ID
-	_      []rlp.RawValue `rlp:"tail"`
+	Tail   []rlp.RawValue `rlp:"tail"`
 }
 
 func (ethEntry) ENRKey() string { return "eth" }