Add portable (stand alone) build for releases

[yekanchi]

add a portable release alongside with msixbundle

• This is useful so people can put terminal on their USB stick with their custom profile.
• Now that PowerShell Core (version 7 ) also provide a stand alone version so a portable terminal can be used with it.
• Other terminals like cmder and ConEmu provide such capability which is very useful.

[skyline75489]

Somewhat related to #7492

[DHowett]

Thanks! this is a /duplicate of #1386

[ghost]

Hi! We've identified this issue as a duplicate of another one that already exists on this Issue Tracker. This specific instance is being closed in favor of tracking the concern over on the referenced thread. Thanks for your report!