core: recover state when beacon sets canonical head if it's missing (#24613)

* core: recover the state in SetChainHead if the head state is missing

* core: disable test logging

* core: address comment from martin

* core: improve log level in case state is recovered

* core, eth, les, light: rename SetChainHead to SetCanonical

light/lightchain.go

@@ -389,7 +389,7 @@ func (lc *LightChain) InsertHeader(header *types.Header) error {
 	return err
 }
 
-func (lc *LightChain) SetChainHead(header *types.Header) error {
+func (lc *LightChain) SetCanonical(header *types.Header) error {
 	lc.chainmu.Lock()
 	defer lc.chainmu.Unlock()