(chore): op-acceptor error handling refactor

[scharissis]

Description

Slight refactor addressing some unresolved comments from a previous PR (#254)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.47059% with 8 lines in your changes missing coverage. Please review.

Project coverage is 53.70%. Comparing base (ddca10c) to head (2f66740).

Files with missing lines	Patch %	Lines
op-acceptor/nat.go	0.00%	5 Missing ⚠️
op-acceptor/runner/runner.go	89.65%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
+ Coverage   53.63%   53.70%   +0.06%     
==========================================
  Files          67       67              
  Lines        7881     7901      +20     
==========================================
+ Hits         4227     4243      +16     
- Misses       3373     3377       +4     
  Partials      281      281              

Flag	Coverage Δ
op-acceptor	55.01% <76.47%> (+0.31%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
op-acceptor/runner/runner.go	69.21% <89.65%> (+0.46%)	⬆️
op-acceptor/nat.go	40.79% <0.00%> (-0.24%)	⬇️

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