Revert "[runtime env] Allow working_dir and py_module to be Path type" #20852
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Reverts #20810
This PR increased the flakiness of test_working_dir to unacceptably high.
The PR is not faulty, it just increases the number of tests and we seem to be hitting the timeout.
Rather than fix-forward, the policy is to revert this PR to fix the build because reverts can be merged without waiting for tests to pass.
After reverting we will split up the working_dir tests into two files to prevent the timeout and un-revert the PR.