Little fixes to facilitate the sharr evaluation

[jmafoster1]

Main changes: Now outputting the raw DAG dot file instead of the causal test visualisation.

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ PYTHON	black	30		1	1.02s
✅ PYTHON	pylint	30		0	4.54s

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.54%. Comparing base (e753b1e) to head (d69008a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #405   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files          25       25           
  Lines        1514     1516    +2     
=======================================
+ Hits         1492     1494    +2     
  Misses         22       22           

Files with missing lines	Coverage Δ
causal_testing/__main__.py	99.16% <100.00%> (+<0.01%)	⬆️
causal_testing/causal_testing_framework.py	100.00% <100.00%> (ø)
causal_testing/discovery/hill_climber_discovery.py	100.00% <100.00%> (ø)

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