Correct paths in the the runut and runft test scripts

[j4james]

This corrects the path to Terminal.Core.Unit.Tests.dll in the runut
unit test script and makes the runft feature test script capable of
working with Release builds as well as Debug builds.

The path to Terminal.Core.Unit.Tests.dll changed when the project was
restructured, and the runut script was never updated to reflect that
change. That has now been corrected.

And the runft script used to be hard coded to look for tests in the
Debug directory, but it has now been updated to use the
%_LAST_BUILD_CONF% environment variable, so it should work for both
Debug and Release builds.

Validation Steps Performed

I've manually confirmed that the runut and runft scripts now work as
expected.

Closes #8485

[zadjii-msft]

thank you

[ghost]

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[DHowett]

@msftbot merge this in 2 minutes

[ghost]

Hello @DHowett!

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