chore(state): extend error handling in core accessor

[vgonkivs]

Overview

Extend error handling in core accessor

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #2307 (03678c4) into main (a01d0b5) will decrease coverage by 0.40%.
The diff coverage is 58.36%.

@@            Coverage Diff             @@
##             main    #2307      +/-   ##
==========================================
- Coverage   50.89%   50.50%   -0.40%     
==========================================
  Files         150      154       +4     
  Lines        9252     9732     +480     
==========================================
+ Hits         4709     4915     +206     
- Misses       4147     4388     +241     
- Partials      396      429      +33     

Impacted Files	Coverage Δ
api/gateway/availability.go	0.00% <ø> (ø)
api/gateway/header.go	0.00% <ø> (ø)
api/gateway/state.go	0.00% <0.00%> (ø)
core/testing.go	91.86% <ø> (-0.10%)	⬇️
core/testing_grpc.go	65.07% <ø> (ø)
das/daser.go	64.83% <0.00%> (ø)
das/metrics.go	9.91% <0.00%> (ø)
header/headertest/testing.go	71.92% <0.00%> (-6.98%)	⬇️
nodebuilder/module.go	85.71% <ø> (ø)
nodebuilder/p2p/bootstrap.go	6.66% <ø> (ø)
... and 36 more

... and 3 files with indirect coverage changes