[Windows] [Backtracing] Add Windows UI app improvements for crash logs.
Hopefully fixes #93126
If the crashing program has no console, launch swift-backtrace.exe with
CREATE_NO_WINDOW so that UI apps don't get a console window flashing up.
Add two Windows-only output-to options:
- eventlog writes the backtrace to the Application event log, split
into multiple events if it is too long. This is the default for
programs that have no console.
- console behaves like stderr, but does not pass CREATE_NO_WINDOW, so
a program without a console can force a console window to be
created for swift-backtrace.exe. If that console was created just
for the backtracer, it waits for a key press before closing.