fix(core-state): remove unnecessary assertion check to enable devnet sync

[bertiespell]

Summary

This removes an assertion check inside block-state.ts which was causing problems with devnet sync. The behaviour was recently added and can therefore be removed. Change supports #3882.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #3885 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #3885   +/-   ##
========================================
  Coverage    97.61%   97.61%           
========================================
  Files          618      618           
  Lines        14430    14433    +3     
  Branches      1726     1725    -1     
========================================
+ Hits         14086    14089    +3     
  Misses         155      155           
  Partials       189      189           

Flag	Coverage Δ
#functional	6.76% <0.00%> (-0.01%)	⬇️
#integration	9.87% <0.00%> (-0.01%)	⬇️
#unit	95.89% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
packages/core-state/src/block-state.ts	100.00% <100.00%> (ø)
packages/core-p2p/src/network-monitor.ts	99.62% <0.00%> (+0.01%)	⬆️

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