Allow vts build without matlab implementation

[scottprahl]

Currently executing

./BuildTestRelease.ps1 

requires a matlab installation. Perhaps the matlab builds could be made optional for those who just want to use vts in a JuptyerLab environment?

[hayakawa16]

Like this suggestion! We are currently working on python scripts so this comment is right in line with our next steps. We will work on a way to opt in and out of these additional tools.

[hayakawa16]

I have determined command to check if matlab is installed or not. I thought I could just edit BuildTestRelease and check before command to Invoke BuildTestReleaseMATLAB, however matlab is also invoked in BuildTestReleaseMCCL. So I added the same if check before that call. I have tried updated code on:

1. windows with matlab installed
2. linux with matlab installed
3. linux with no matlab available
   and these run as they should.
   I have pushed these changes to the branch associated with this issue and will create a PR for review.