Fix business potential returned by company export wins endpoint.

[elcct]

Description of change

This returns business potential name instead of business potential legacy export wins id.

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 96.23%. Comparing base (adab1a2) to head (d7b2559).
Report is 409 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5616   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files         974      974           
  Lines       22995    22995           
  Branches     2064     2064           
=======================================
  Hits        22130    22130           
+ Misses        706      705    -1     
- Partials      159      160    +1     

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