[backend] Fix inject status delete cascading

[RomuDeuxfois]

• When I remove a simulation, some time I have this

error
: 
"could not execute statement [ERROR: null value in column \"status_inject\" of relation \"injects_tests_statuses\" violates not-null constraint\n  Detail: Failing row contains (6c732625-161b-4f47-b065-4988c22bb961, SUCCESS, [{\"execution_time\":\"2024-09-13T13:53:25.610690185Z\",\"execution_d..., 2024-09-13 13:53:25.618166, null, 2024-09-13 13:53:25.618205, 0, 1, 0, 1, null, 2024-09-13 13:44:23.053403, 2024-09-13 13:53:26.36281).\n  Where: SQL statement \"UPDATE ONLY \"public\".\"injects_tests_statuses\" SET \"status_inject\" = NULL WHERE $1::pg_catalog.text OPERATOR(pg_catalog.=) \"status_inject\"::pg_catalog.text\"] [delete from exercises where exercise_id=?]"
message
: 
"Error applying constraint status_inject\" of relation \"injects_tests_statuses"
type
: 
"ConstraintViolationException"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.35%. Comparing base (6e782f9) to head (16bd728).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1447      +/-   ##
============================================
+ Coverage     31.32%   31.35%   +0.03%     
- Complexity     1400     1402       +2     
============================================
  Files           526      527       +1     
  Lines         13693    13700       +7     
  Branches        814      814              
============================================
+ Hits           4289     4296       +7     
  Misses         9204     9204              
  Partials        200      200              

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