[test] Avoid using GetRootSys() in unit tests
#20807
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The input files for `testHistFactory` are always copied to the directory where the tests are run by CMake.
This is done in particular to avoid some usage of `GetRootSys()`.
It's not good to include the standard headers in a loop, and actually causes the test to fail in my environment by somehow causing symbol lookup failures. The errors are fixed by just not including `<vector>`, which is not necessary in Cling anyway.
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We want to rely less on environment variables like
ROOTSYS.See also the discussion in #20006 (comment)