Remove failing test for composition of models

[coveralls]

Pull Request Test Coverage Report for Build 2311659159

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 40.251%

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Files with Coverage Reduction	New Missed Lines	%
src/Kendrick-Core/KEModelPart.class.st	7	62.31%
<!--	Total:	7		-->

Totals
Change from base Build 2311635552:	-0.1%
Covered Lines:	5834
Relevant Lines:	14494

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💛 - Coveralls