Output financial year for Win breakdown dataset.

[elcct]

Description of change

This replaces relative year in Breakdowns with actual financial year based on related Win created date.

Pseudo code:
Financial Year = get_financial_year(win.created_on) + (breakdown.year - 1)

Financial year is assumed from 1 April to 31 March.

Example:
If Win was created on 02/2024 and breakdown year is 1, then financial year is 2023
If Win was created on 04/2024 and breakdown year is 1, then financial year is 2024
If Win was created on 02/2024 and breakdown year is 2, then financial year is 2024

Checklist

• Has this branch been rebased on top of the current main branch?

  Explanation

  The branch should not be stale or have conflicts at the time reviews are requested.

• Is the CircleCI build passing?

General points

Other things to check

• Make sure fixtures/test_data.yaml is maintained when updating models
• Consider the admin site when making changes to models
• Use select-/prefetch-related field lists in views and search apps, and update them when fields are added
• Make sure the README is updated e.g. when adding new environment variables

See docs/CONTRIBUTING.md for more guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.45%. Comparing base (95ab095) to head (4caeb9e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5301      +/-   ##
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- Coverage   96.46%   96.45%   -0.01%     
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  Files         923      923              
  Lines       21873    21873              
  Branches     1959     1959              
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- Hits        21100    21098       -2     
- Misses        625      626       +1     
- Partials      148      149       +1     

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