Patch JavaScript build packages (AcademySoftwareFoundation#2557)

## Updates

- Fix the packages used for MaterialXTest and MaterialXView so that they are compatible with the current version of NodeJS used (16.20.2).  
- The default emscripten 2.0.20 utility script sets NodeJS version to a version which is too old and will result in possible incompatibilities.
- Lock the packages versions until such time as NodeJS version is changed. 
  - This will avoid new package versions from accidently being installed (via npm install) which **has already occurred**.
  - For example the build / tests / installs using packages for NodeJS 18 will not work as the current code is not compatible with changes from 16 to 18.

- *Note* This does not try to bump any version of emcripten or NodeJS, it just fixes so that the appropriate packages are now used.

- Fixes: AcademySoftwareFoundation#2547,  AcademySoftwareFoundation#2545

## Tests

- Cleaned out node modules and rebuild locked package manifest.
- Rebuilt, tested and run on Windows local and via CI. CI no longer shows any warnings / error messages.

## Documentation

- Updated with appropriate NodeJS version information
- Fix documentation for emscripten version as not any verson can be used. Note the locked version require.

Author: kwokcb