Host needs updating for $psStyle

[jhoneill]

I filed an issue on the mail PowerShell project PowerShell/PowerShell#16643
Basically hosts other than "ConsoleHost" - including the Visual Studio Code Host need to be updated so that when $PSStyle.OutputRendering is set to plaintext Ansi colours are not sent to the terminal

Above you can see the green row labels in the PowerShell Integrated Console. Below you can see they're mono in the PWSH console.

What I'm being told over there is that fix goes with the host. hence creating this one.

[andyleejordan]

Thanks for the bug report @jhoneill! We have a lot of work to do for the integrated console's host, especially with respect to the new PSStyle APIs.

[jhoneill]

@andschwa See also
PowerShell/PowerShell#16643
There's a discussion going on about whether this should be in host, and if it reasonable to drop this work onto you.