coordinator: fix BlockCreationMonitorTest flacky test

[jpnovais]

This PR implements issue(s) #612

Checklist

• I wrote new tests for my new core changes.
• I have successfully ran tests, style checker and build against my new changes locally.
• I have informed the team of any breaking changes if there are any.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.71%. Comparing base (c819e31) to head (7a38838).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #624      +/-   ##
============================================
- Coverage     68.74%   68.71%   -0.04%     
+ Complexity     1186     1185       -1     
============================================
  Files           324      324              
  Lines         13190    13190              
  Branches       1317     1317              
============================================
- Hits           9068     9064       -4     
- Misses         3572     3573       +1     
- Partials        550      553       +3     

Flag	Coverage Δ		*Carryforward flag
hardhat	99.05% <ø> (ø)		Carriedforward from c819e31
kotlin	66.36% <ø> (-0.04%)	⬇️

*This pull request uses carry forward flags. Click here to find out more.

see 5 files with indirect coverage changes