[Oxfordshire] Don’t allow defects to be raised on closed reports

[davea]

For FD-7009

[skip changelog]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.38%. Comparing base (941270a) to head (eee5f2d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5983      +/-   ##
==========================================
- Coverage   83.38%   83.38%   -0.01%     
==========================================
  Files         496      496              
  Lines       37056    37056              
  Branches     6131     6131              
==========================================
- Hits        30900    30898       -2     
- Misses       4354     4356       +2     
  Partials     1802     1802              

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