Add Nomad Job Event Handling

[mpass99]

for more reliant event handling.
In recent cases, we have observed Nomad not sending Allocation-stopping events but just JobDeregistered events. We add a handling of those to capture also these cases.

Closes #649

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.40%. Comparing base (a035d62) to head (9e2e8b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #682      +/-   ##
==========================================
+ Coverage   76.19%   76.40%   +0.20%     
==========================================
  Files          43       43              
  Lines        3592     3615      +23     
==========================================
+ Hits         2737     2762      +25     
+ Misses        625      624       -1     
+ Partials      230      229       -1     

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[MrSerth]

Awesome, thanks for adding the first event listener for job events. Now, we're also able to add new event listeners for job events more easily, if needed 👍

I've tested the behavior on staging and think it's ready to ship 🚢

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Environment stopped unexpectedly `` View Issue
• ‼️ Environment stopped unexpectedly `` View Issue

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