Fix task handlers for multiple process instances with same user task IDs

[erinoggz]

Motivation/Abstract

This is a bug fix for multiple process instances with identical task IDs where only the first created instance could complete its tasks while subsequent instances remained stuck. The findOrCreateJob function was returning existing jobs based only on ElementId, causing job conflicts between different process instances. This fix ensures each process instance gets its own jobs by also checking ProcessInstanceKey during job lookup.

Description/Comments

The bug occurred because findOrCreateJob only checked job.ElementId == be.GetId() when looking for existing jobs, causing jobs to be shared across different process instances that had the same task IDs. The fix adds an additional check for job.ProcessInstanceKey == instance.GetInstanceKey() to ensure proper job isolation per instance. This maintains the intended behavior where jobs are reused within the same process instance but isolated between different instances.

Checklist

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[nitram509]

Excellent catch, thank you @erinoggz for fixing this.
PS: sorry for my late reply, and thanks for the notch at LinkedIn.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.81%. Comparing base (0e2a093) to head (14ebb9c).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #279   +/-   ##
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  Coverage   63.81%   63.81%           
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  Files          28       28           
  Lines        1915     1915           
=======================================
  Hits         1222     1222           
  Misses        647      647           
  Partials       46       46           

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