Bugfix for track selector

[dkobylianskii]

Summary

This pull request introduces the following changes

• Set unsigned variables to 0 in order to handle cases like numberOfSCTSharedHits
• Update mock tracks variable dtypes to be consistent with TDD output

Conformity

• [x] Changelog entry
• [x] Documentation

[samvanstroud]

@dkobylianskii some tests are failing, could you take a look?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.10%. Comparing base (c23f38a) to head (d5626da). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #98 +/- ## ========================================== + Coverage 98.09% 98.10% +0.01% ========================================== Files 39 39 Lines 2258 2271 +13 ========================================== + Hits 2215 2228 +13 Misses 43 43 ```

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[samvanstroud]

Great thanks @dkobylianskii!