[cli] Replace update-notifier dependency with built in (#8090)

This PR replaces the `update-notifier` dependency with a custom
implementation.

There are a few reasons: the dependency is quite large, it requires ESM
in order to update, and can sometimes suggest an update to an older
version. For example:


![image](https://user-images.githubusercontent.com/229881/195891579-c8c047a6-51ec-45f2-b597-daf927f48203.png)


- Related to #8038

Co-authored-by: Chris Barber <chris.barber@vercel.com>
Co-authored-by: Chris Barber <chris@cb1inc.com>
Co-authored-by: Sean Massa <EndangeredMassa@gmail.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/cli/scripts/build.ts

@@ -1,7 +1,7 @@
 import cpy from 'cpy';
 import execa from 'execa';
 import { join } from 'path';
-import { remove, writeFile } from 'fs-extra';
+import { remove, readJSON, writeFile } from 'fs-extra';
 
 const dirRoot = join(__dirname, '..');
 const distRoot = join(dirRoot, 'dist');
@@ -43,15 +43,15 @@ async function main() {
     stdio: 'inherit',
   });
 
+  const pkg = await readJSON(join(dirRoot, 'package.json'));
+  const dependencies = Object.keys(pkg?.dependencies ?? {});
   // Do the initial `ncc` build
-  console.log();
-  const args = [
-    'ncc',
-    'build',
-    '--external',
-    'update-notifier',
-    'src/index.ts',
-  ];
+  console.log('Dependencies:', dependencies);
+  const externs = [];
+  for (const dep of dependencies) {
+    externs.push('--external', dep);
+  }
+  const args = ['ncc', 'build', 'src/index.ts', ...externs];
   await execa('yarn', args, { stdio: 'inherit', cwd: dirRoot });
 
   // `ncc` has some issues with `@vercel/fun`'s runtime files:
@@ -78,6 +78,10 @@ async function main() {
   // Band-aid to bundle stuff that `ncc` neglects to bundle
   await cpy(join(dirRoot, 'src/util/projects/VERCEL_DIR_README.txt'), distRoot);
   await cpy(join(dirRoot, 'src/util/dev/builder-worker.js'), distRoot);
+  await cpy(
+    join(dirRoot, 'src/util/get-latest-version/get-latest-worker.js'),
+    distRoot
+  );
 
   console.log('Finished building Vercel CLI');
 }