Intervention testing

[morganle-48]

This branch was used to fix the issues with pre-emptive transplants and then add the new HHD intervention using the simpy interrupt function.

[morganle-48]

Closes #182 and #183

[yiwen-h]

Hello! We need to sort the failing checks before approving - do you need help with that @morganle-48? maybe we could put some time in to investigate and fix together as a pair programming thing

[morganle-48]

That would be ideal - managed to fix the other two but then ran short on time. I'll send you an invite

[yiwen-h]

Thank you!

[codecov]

Codecov Report

❌ Patch coverage is 52.14286% with 67 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.63%. Comparing base (f4d67d4) to head (fd31c4d).
⚠️ Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
renal_capacity_model/model.py	50.37%	59 Missing and 7 partials ⚠️
renal_capacity_model/load_scenario.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
- Coverage   84.77%   79.63%   -5.15%     
==========================================
  Files           9        9              
  Lines         703      815     +112     
  Branches       78       94      +16     
==========================================
+ Hits          596      649      +53     
- Misses         98      150      +52     
- Partials        9       16       +7     

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