[#3689] Fix filesystem searcher and tests that mock it #4271
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resolves #3689
Description
With Python 3.9 we were getting a unit test failure which was due to a leftover mock from a different test. The reason for this isn't totally clear; it might possibly be a Python bug, but isn't worth chasing down. This converts the filesystem searcher to a simple function and changes the mock to explicitly be on the function used in test_graph.py.
Checklist
CHANGELOG.md
and added information about my change