Add export experience field to public Export Wins endpoint.

[elcct]

Description of change

This adds export_experience field to public facing Export Wins endpoint.

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 96.47%. Comparing base (faa254d) to head (6e536e7).

❗ Current head 6e536e7 differs from pull request most recent head 4656cbd. Consider uploading reports for the commit 4656cbd to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5323   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files         925      925           
  Lines       21906    21907    +1     
  Branches     1961     1961           
=======================================
+ Hits        21133    21134    +1     
  Misses        625      625           
  Partials      148      148           

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