RCORE-2148 Reconnect Hang Analyzer to evergreen

[jsflax]

The hang analyzer became disconnected due to a variable working dir, incorrect precondition checks on the requirements.txt file, and the python venv being updated to 3.12.

• Update paths to use realm-core as the working directory.

• Change -d check to -f check for requirements.txt precondition.

• Add setuptools to requirements.txt because distutils is no longer included with python3.12.

[coveralls-official]

Pull Request Test Coverage Report for Build jason.flax_720

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1128 unchanged lines in 24 files lost coverage.
• Overall coverage increased (+0.008%) to 90.817%

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Files with Coverage Reduction	New Missed Lines	%
src/realm/index_string.hpp	1	93.48%
src/realm/object-store/c_api/types.hpp	1	77.12%
src/realm/sync/client.hpp	1	97.73%
src/realm/sync/network/default_socket.hpp	1	94.12%
src/realm/util/file.cpp	1	78.73%
test/test_index_string.cpp	1	93.48%
src/realm/list.cpp	2	85.69%
src/realm/sync/network/http.hpp	2	82.27%
test/fuzz_group.cpp	2	45.77%
src/realm/set.cpp	3	91.07%

Totals
Change from base Build 2356:	0.008%
Covered Lines:	214633
Relevant Lines:	236337

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💛 - Coveralls

[michael-wb]

LGTM

[michael-wb]

Add a -p so it doesn't fail if the directory already exists (it shouldn't, but just in case)
mkdir -p hang_analyzer_workdir; ...