[tests][cli] convert CLI integration tests to TS (#9672)

Converts the CLI integration tests to TypeScript. This will make it easier to pick apart the test pollution.

test/lib/deployment/now-deploy.js

@@ -199,6 +199,9 @@ async function fetchCachedToken() {
   return token;
 }
 
+/**
+ * @returns { Promise<String> }
+ */
 async function fetchTokenWithRetry(retries = 5) {
   const {
     NOW_TOKEN,