Log Bad Requests to Export Win endpoints.

[elcct]

Description of change

This should let us debug instances of 400 Bad Request returned to the client much easier.
The decorator will log 400 error for post and patch methods of 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-commenter]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 96.53%. Comparing base (b261ba9) to head (d70d897).

Files	Patch %	Lines
datahub/export_win/views.py	95.23%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5350      +/-   ##
==========================================
- Coverage   96.54%   96.53%   -0.01%     
==========================================
  Files         926      926              
  Lines       21971    21991      +20     
  Branches     1965     1966       +1     
==========================================
+ Hits        21211    21230      +19     
  Misses        616      616              
- Partials      144      145       +1     

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