[feat] Add option to disable test stage directory cleanup #1404
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In the past we removed the stage directory of a test in two places. Inside the
RuntimeContextand inside and low-levelos_ext.copytree()function. We have changedcopytree()and made it completely compatible with Python 3.8, which has added thedirs_exist_okargument. It does not remove the target directory if it exists, as it was the previous version. Responsible for removing the stage directory is only theRuntimeContext.I want some feedback about the name of the command-line option and the naming of the configuration option as well.
Fixes #1366.