Bump @xmldom/xmldom and react-native-windows in /samples/hello-world-js (#1376)

Removes [@xmldom/xmldom](https://github.com/xmldom/xmldom). It's no longer used after updating ancestor dependency [react-native-windows](https://github.com/microsoft/react-native-windows/tree/HEAD/vnext). These dependencies need to be updated together.


Removes `@xmldom/xmldom`

Updates `react-native-windows` from 0.70.2 to 1.0.0
- [Release notes](https://github.com/microsoft/react-native-windows/releases)
- [Changelog](https://github.com/microsoft/react-native-windows/blob/main/vnext/CHANGELOG.json)
- [Commits](https://github.com/microsoft/react-native-windows/commits/HEAD/vnext)

---
updated-dependencies:
- dependency-name: "@xmldom/xmldom"
  dependency-type: indirect
- dependency-name: react-native-windows
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

samples/hello-world-js/package.json

@@ -45,7 +45,7 @@
     "react": "16.12.0",
     "react-dom": "16.12.0",
     "react-native": "0.70.2",
-    "react-native-windows": "0.70.2",
+    "react-native-windows": "1.0.0",
     "reactxp": "^2.0.0",
     "reactxp-imagesvg": "^2.0.0",
     "reactxp-navigation": "^2.0.0",