Replace lead officer email with contact email for notifications.

[elcct]

Description of change

This gets Export win notifications to be sent to lead officer's contact email, rather than email.

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 (8d1968c) to head (a01a575).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5295      +/-   ##
==========================================
- Coverage   96.46%   96.45%   -0.01%     
==========================================
  Files         922      922              
  Lines       21853    21853              
  Branches     1954     1954              
==========================================
- Hits        21081    21079       -2     
- Misses        625      626       +1     
- Partials      147      148       +1     

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