Fee Recipient : ux log fixes and prevent validator from calling beacon node if flags are not provided. (#10406)

* initial commit

* improving logs

validator/accounts/testing/mock.go

@@ -179,7 +179,7 @@ func (_ MockValidator) CheckDoppelGanger(_ context.Context) error {
 	panic("implement me")
 }
 
-// PrepareBeaconProposer for mocking
+// UpdateFeeRecipient for mocking
 func (_ MockValidator) UpdateFeeRecipient(_ context.Context, _ keymanager.IKeymanager) error {
 	panic("implement me")
 }