bugfix/RR-1358-searching-on-export-wins

[chopkinsmade]

Description of change

Allow searching in the admin page on company id, company name, country name and sector name for export wins

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 96.46%. Comparing base (9a6f54f) to head (afebfdb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5326      +/-   ##
==========================================
- Coverage   96.47%   96.46%   -0.01%     
==========================================
  Files         925      925              
  Lines       21931    21931              
  Branches     1963     1963              
==========================================
- Hits        21158    21156       -2     
- Misses        625      626       +1     
- Partials      148      149       +1     

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