Fix case mismatching modules during namespace package search #11261
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For example
from a import B
should not find a namespacepackage
a/B/
. Fix by using case aware isdir on fscache.Helps unblock #9636
Test Plan
There are several existing tests for this area. I split one of the tests by namespace package for straddling.
I also tested this diff on top of #9636 and confirmed it helps!