[backend] fix: add orphanRomoval parameter for Scenarion/inject relat…

[heditar]

…ionship

Proposed changes

• Spring upgrade created a bug that was throwing an error while trying to delete a scenario/simulation. This PR fix this issue by adding cascade = CascadeType.REMOVE orphanRemoval = true to the relationship

Testing Instructions

1. Create a scenario/simulation, add an inject, delete ii -> it should succeed

Related issues

• Product testing bug

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• [NA] I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.57%. Comparing base (c48c40e) to head (a3466a3).
⚠️ Report is 20 commits behind head on release/current.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             release/current    #4968      +/-   ##
=====================================================
+ Coverage              56.54%   56.57%   +0.03%     
- Complexity              4472     4615     +143     
=====================================================
  Files                    991     1002      +11     
  Lines                  29665    30329     +664     
  Branches                2167     2236      +69     
=====================================================
+ Hits                   16775    17160     +385     
- Misses                 11932    12203     +271     
- Partials                 958      966       +8     

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