CloudFormation: Support AWS::EMR::InstanceGroupConfig

[bblommers]

Fixes #7381

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.80%. Comparing base (9aef694) to head (c562a96).
Report is 88 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7446      +/-   ##
==========================================
- Coverage   95.88%   95.80%   -0.08%     
==========================================
  Files         843      849       +6     
  Lines       82578    83713    +1135     
==========================================
+ Hits        79178    80203    +1025     
- Misses       3400     3510     +110     

Flag	Coverage Δ
servertests	32.30% <40.00%> (-0.22%)	⬇️
unittests	95.77% <100.00%> (-0.08%)	⬇️

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[github-actions]

This is now part of moto >= 5.0.3.dev59