For DAP try using debug filename pattern for debug binary path before using random string. fix for #3494 (new Windows Firewall detections)

[rustyoz]

Instead of using the pattern that is always randomized, check if it doesn't exist otherwise use a random filename including the pattern.

Removes annoying windows firewall issue #3494

[aarzilli]

TestStaticcheck and TestDefaultBinary are failing.

[derekparker]

@rustyoz are you still planning on working on this?