DRAFT: Verification of non-system-chunk service events

[jordanschalm]

Implements a basic version of Proposal 1 from #6622. Most likely we will go ahead with Proposal 2 and discard this PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.86486% with 13 lines in your changes missing coverage. Please review.

Project coverage is 41.72%. Comparing base (5ae48c4) to head (e265500).

Files with missing lines	Patch %	Lines
model/flow/execution_result.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           feature/efm-recovery    #6629    +/-   ##
======================================================
  Coverage                 41.72%   41.72%            
======================================================
  Files                      2019     2028     +9     
  Lines                    179401   180229   +828     
======================================================
+ Hits                      74849    75197   +348     
- Misses                    98395    98839   +444     
- Partials                   6157     6193    +36     

Flag	Coverage Δ
unittests	41.72% <64.86%> (+<0.01%)	⬆️

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