This patch should fix a Windows test failure for the
InvalidScriptedThread test:
https://lab.llvm.org/buildbot/#/builders/83/builds/12571
This refactors the test to stop using python `tempfile` since it's not
supported on Windows and creates a logfile at runtime in the test folder.
Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>