fix(ci): downgrade npm auth token list check failure to warning

Author: Saadnajmi

.ado/scripts/prepublish-check.mjs

@@ -90,7 +90,7 @@ function loadNxConfig(configFile) {
   return JSON.parse(nx);
 }
 
-export function verifyNpmAuth(registry = NPM_DEFEAULT_REGISTRY) {
+function verifyNpmAuth(registry = NPM_DEFEAULT_REGISTRY) {
   const npmErrorRegex = /npm error code (\w+)/;
   const spawnOptions = {
     stdio: /** @type {const} */ ("pipe"),
@@ -103,7 +103,8 @@ export function verifyNpmAuth(registry = NPM_DEFEAULT_REGISTRY) {
   if (whoami.status !== 0) {
     const error = whoami.stderr.toString();
     const m = error.match(npmErrorRegex);
-    switch (m && m[1]) {
+    const errorCode = m && m[1];
+    switch (errorCode) {
       case "EINVALIDNPMTOKEN":
         throw new Error(`Invalid auth token for npm registry: ${registry}`);
       case "ENEEDAUTH":