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This is removing references to tempdir and replacing with tempfile.
All the changes are in test code or in things like test_utils.
This is a creation of #3209 not on an external fork to resolve an issue with CI.
Motivation
Tempdir is deprecated. And it is needed in order to mitigate a vulnerability in a dependency in tempdir on remove_dir_all: https://rustsec.org/advisories/RUSTSEC-2023-0018
Future Work
There will likely need to be a follow up pr to address the use of slog-gelf which also has a dependency on tempdir.
Soundtrack of this PR