[6.1][Backtracing] Add warning suppression option, enable it for tests. #81803
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[Backtracing] Add warning suppression option, enable it for tests.
The backtracing code will warn you if you attempt to forcibly enable backtracing for a privileged executable. This is apparently upsetting the Driver/filelists.swift test.
Since we want to force it on for tests, so that we will definitely get backtraces, add an option to suppress warning messages, and turn that on for tests as well.
rdar://152074531