remove specific programmes field from the serializer

[Richard-Pentecost]

Description of change

Remove the serializer field for the specific programmes

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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.39%. Comparing base (1ffd2f8) to head (8168a52).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5483   +/-   ##
=======================================
  Coverage   96.38%   96.39%           
=======================================
  Files         953      953           
  Lines       22516    22515    -1     
  Branches     2022     2022           
=======================================
+ Hits        21703    21704    +1     
+ Misses        660      659    -1     
+ Partials      153      152    -1     

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