Only print the path warnings once

We could reset and rerun it on server rebuilds, but that report needs a full build to make sense.

Also clean up the config vs flags in this area: Make all config settings match the flags e.g. `printPathWarnings`, but set up aliases for the
old.

Fixes #11187

commands/helpers.go

@@ -79,11 +79,9 @@ func flagsToCfgWithAdditionalConfigBase(cd *simplecobra.Commandeer, cfg config.P
 
 	// Flags with a different name in the config.
 	keyMap := map[string]string{
-		"minify":            "minifyOutput",
-		"destination":       "publishDir",
-		"printI18nWarnings": "logI18nWarnings",
-		"printPathWarnings": "logPathWarnings",
-		"editor":            "newContentEditor",
+		"minify":      "minifyOutput",
+		"destination": "publishDir",
+		"editor":      "newContentEditor",
 	}
 
 	// Flags that we for some reason don't want to expose in the site config.