fix: return correct exit code on engine error

[kylezs]

Pull Request

Closes: PRO-1887

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

Given we never expect the engine to exit, when it does exit it should exit with a "1" exit code, so unix systems can interpret it as an error correctly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72%. Comparing base (74e50be) to head (22c0cb8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5470    +/-   ##
======================================
- Coverage     72%     72%    -0%     
======================================
  Files        494     494            
  Lines      88050   87926   -124     
  Branches   88050   87926   -124     
======================================
- Hits       63159   62981   -178     
- Misses     22312   22365    +53     
- Partials    2579    2580     +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.