Remove update notifier

This PR removes the update check, which logs about newer version for
code-push-cli. Since this CLI version is not linked to the deprecated
[code-push-cli](https://www.npmjs.com/package/code-push-cli) package and
no releases are planned, we don't need the update check.

Author: DmitriyKirakosyan

cli/package-lock.json

@@ -36,7 +36,6 @@
     "rimraf": "^2.5.1",
     "semver": "^7.5.3",
     "simctl": "^2.0.3",
-    "simple-update-notifier": "^2.0.0",
     "slash": "1.0.0",
     "superagent": "^8.0.9",
     "which": "^1.2.7",

cli/package.json

@@ -4,7 +4,6 @@
 import * as yargs from "yargs";
 import * as cli from "../script/types/cli";
 import * as chalk from "chalk";
-const updateNotifier = require("simple-update-notifier");
 import backslash = require("backslash");
 import parseDuration = require("parse-duration");
 
@@ -28,21 +27,13 @@ export function showHelp(showRootDescription?: boolean): void {
       console.log(chalk.cyan("======================================"));
       console.log("");
       console.log("CodePush is a service that enables you to deploy mobile app updates directly to your users' devices.\n");
-      updateCheck();
     }
 
     yargs.showHelp();
     wasHelpShown = true;
   }
 }
 
-function updateCheck(): void {
-  const notifier = updateNotifier({ pkg: packageJson });
-  if (notifier.update) {
-    notifier.notify();
-  }
-}
-
 function accessKeyAdd(commandName: string, yargs: yargs.Argv): void {
   isValidCommand = true;
   yargs