v5.0-test-nested-loops: Test for map inside fold

[jozanek]

Closes #464

[codecov]

Codecov Report

Merging #788 (53ea2a4) into v5.0-todo-mainnet (a3b0645) will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           v5.0-todo-mainnet     #788   +/-   ##
==================================================
  Coverage              71.78%   71.78%           
==================================================
  Files                    248      248           
  Lines                  18814    18814           
  Branches                 630      636    +6     
==================================================
  Hits                   13506    13506           
  Misses                  5308     5308           

Impacted Files	Coverage Δ
...ain/scala/special/collection/CollsOverArrays.scala	86.74% <0.00%> (-0.29%)	⬇️
...cala/sigmastate/serialization/DataSerializer.scala	98.70% <0.00%> (+1.29%)	⬆️

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