[backend] fix(perf): improving latency on Simulation reset api (#4336)

[heditar]

Proposed changes

• Adding repo method to clean Injects without using .clear() on several inject attributes
• On my machine, I was able to reproduce perfoimance issue by creation 100+ scenarios with 100+ simulation each and this change improve the latency from >20s to <1sec

Testing Instructions

1. Create a simulation with injects and run it
2. This simulation should have findings,communication and expectation on these injects
3. Reset the simulation
4. Verify that findings,communications and expectation are deleted

Note: to test the perf improvement you need to load your db with scenarionwith lot simu

Related issues

• Closes Reset a simulation takes a lot of time #4336

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case -> test cases will be added to the perf tests
• [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 -> going to the perf tests in another review

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.26%. Comparing base (469665c) to head (427c1db).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4650   +/-   ##
=========================================
  Coverage     50.25%   50.26%           
- Complexity     3654     3655    +1     
=========================================
  Files           897      897           
  Lines         26666    26671    +5     
  Branches       1995     1995           
=========================================
+ Hits          13402    13407    +5     
  Misses        12461    12461           
  Partials        803      803           

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