Always use a new tmpdir when executing with the process worker #17370
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When refactoring the process worker to use a Runner in #17295 we introduced a working directory bug in which, if a working directory was not already provided, we used the working directory from when the
worker start
command was run.This is problematic for remote storage, especially
git
, and so this PR ensures the process worker always creates and manages a temporary working directory per-run.Closes #17317