ECS: service should have networkConfiguration

[rafcio19]

Resolves #8258

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.57%. Comparing base (10bdd08) to head (44ae6f1).

Files with missing lines	Patch %	Lines
moto/ecs/exceptions.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8318   +/-   ##
=======================================
  Coverage   94.57%   94.57%           
=======================================
  Files        1159     1159           
  Lines      100936   100961   +25     
=======================================
+ Hits        95458    95482   +24     
- Misses       5478     5479    +1     

Flag	Coverage Δ
servertests	28.89% <16.00%> (-0.01%)	⬇️
unittests	94.54% <96.00%> (+<0.01%)	⬆️

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