Add warnidf template function

Also rename config `ignoreErrors` => `ignoreLogs`

But the old still works.

Closes #9189

hugolib/site_new.go

@@ -124,7 +124,7 @@ func NewHugoSites(cfg deps.DepsCfg) (*HugoSites, error) {
 			Stdout:             cfg.LogOut,
 			Stderr:             cfg.LogOut,
 			StoreErrors:        conf.Running(),
-			SuppressStatements: conf.IgnoredErrors(),
+			SuppressStatements: conf.IgnoredLogs(),
 		}
 		logger = loggers.New(logOpts)
 	}