Try not using gensym for testsetup module names

[nickrobinson251]

current using @testsetup module means error messages/tracebacks that refer to it get really ugly names like
Main.var"##FDSetup#298", eg:

    [2] fd_test(::Type, ::Vararg{Any}; verbose::Bool)
      @ Main.var"##FDSetup#298" ~/base-fds/test/base-fd-tests.jl:259

[rntz]

Any idea what went wrong with the tests here

[rntz]

looks like the tests that failed were precisely the ones testing log capture?

[Drvi]

Looking the CI logs, IIUC, a new warning showed up WARNING: replacing module LoggingTestSetup, breaking some of the log capture tests.