PFS test should save timing output to the baseline directory

[billsacks]

It would be very useful if the PFS test saved timing output to the baseline directory. That way, if you have a PFS test in the test suite, you can more easily compare the current timing with the previous timing.

I'm thinking it may be hard to customize baseline generation for a single test type like this; if so, maybe we should just save the timing files for all tests. (Those files are typically fairly small.)

[github-actions]

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