migrated fixes from hutch-cohort-discovery#166

[beforan]

Pull Request Contents

🦋 Bug Fix

Description

This PR applies Health-Informatics-UoN/hutch-cohort-discovery#166 against the new Bunny repo.

Huge thanks to @asquirenhs for the original PR. Sorry it occurred as we were moving the codebase.

Related Issues or other material

• This PR relates to one or more issues, detailed below

• Closes Bunny Demographics Distribution query does not include the expected file name in output #14

✅ Added/updated tests?

• This PR contains relevant tests
  • Or doesn't need to per the below explanation

new distribution query tests added in the PR:

================================================ test session starts =================================================
platform linux -- Python 3.13.1, pytest-8.3.4, pluggy-1.5.0
rootdir: /home/beforan/src/hutch-bunny
configfile: pyproject.toml
collected 9 items                                                                                                    

tests/test_demographics_distribution_query.py .....                                                            [ 55%]
tests/test_return.py ....                                                                                      [100%]

================================================= 9 passed in 2.00s ==================================================

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