add gitleaks hook to pre-commit

[danielfromearth]

GitHub Issue: #112

Description

Add gitleaks to the pre-commit hooks.

PR Acceptance Checklist

• Unit tests added/updated and passing.
• Integration testing
• CHANGELOG.md updated
• Documentation updated (if needed).

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📚 Documentation preview 📚: https://ncompare--261.org.readthedocs.build/en/261/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.94%. Comparing base (414a9ce) to head (439266a).
Report is 3 commits behind head on release/1.11.0.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/1.11.0     #261   +/-   ##
===============================================
  Coverage           90.94%   90.94%           
===============================================
  Files                   5        5           
  Lines                 464      464           
===============================================
  Hits                  422      422           
  Misses                 42       42           

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