Issue running demos on Windows (path/rootDir issue)

[hhkaos]

Describe the bug

While trying to run npm start on Windows in the demo folders, which runs node ../../scripts/run-demo-server.js it throws an error in the following line:
https://github.com/Esri/arcgis-rest-js/blob/main/scripts/get-package-json.js#L19

The problem is that the build path in rootDir has a semicolon (something like /D:/..), and it is causing an exception in Linux based shells like Gitbash.

Reproduction

You will probably need a Windows machine a follow any of the instructions (e.g. job demo instructions)

Logs

Sorry, I don't have them.

System Info

Windows 11.
It was this repo at this point, so ArcGIS REST JS Version: 4.1.4

Additional Information

Sorry, I can not provide more context. It was an easy fix, we just removed the semicolon locally, but I don't have time to submit a PR right now, but I wanted to at least issue this.

[gavinr-maps]

I do get an error when run:

cd demos/geocoder-browser
npm i
npm start

... on Windows 10 in Powershell.

The error I get:

> @esri/arcgis-rest-geocoder-vanilla@3.3.0 start
> node ../../scripts/run-demo-server.js

node:internal/errors:496
    ErrorCaptureStackTrace(err);
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received null
    at new NodeError (node:internal/errors:405:5)
    at validateString (node:internal/validators:162:11)
    at join (node:path:429:7)
    at getPackages (file:///C:/_work/arcgis-rest-js/scripts/get-package-json.js:19:37)
    at async file:///C:/_work/arcgis-rest-js/scripts/run-demo-server.js:7:20 {
  code: 'ERR_INVALID_ARG_TYPE'
}

Node.js v18.17.1
npm ERR! Lifecycle script `start` failed with error:
npm ERR! Error: command failed
npm ERR!   in workspace: @esri/arcgis-rest-geocoder-vanilla@3.3.0
npm ERR!   at location: C:\_work\arcgis-rest-js\demos\geocoder-browser

I agree with @hhkaos that we need to get the script at https://github.com/Esri/arcgis-rest-js/blob/main/scripts/get-package-json.js#L19 to be more Windows friendly.

[COV-GIS]

__dirname is not being constructed properly. The root should be the project directory not the full path of the project directory on disk.

import * as url from 'url';
import { readFile } from "fs/promises";
import { globby } from "globby";
import pkgDir from "pkg-dir";
import { join } from "path";

const __dirname = url.fileURLToPath(new URL('.', import.meta.url));

/**
 * Returns an object like:
 *
 * {
 *   packageName: package.json contents
 * }
 *
 * For all packages in the packages/* folder.
 */
export default async function getPackages() {
  const rootDir = await pkgDir(__dirname);
  const packageFiles = await globby(join(rootDir, "packages/*/package.json"));
  return Promise.all(
    packageFiles.map((pkgPath) => {
      return readFile(pkgPath).then((pkg) => {
        return JSON.parse(pkg);
      });
    })
  );
}