Add `package-sis-integrations` to composer.json custom package array #17946

Job	Run time
Run PM4-workflow / Delete Instance	5s
Run PM4-workflow / deploy-EKS	0s
Run PM4-workflow / build-docker-image-EKS	0s
Run PM4-workflow / run-phpunit	0s
Run PM4-workflow / Run API Tests	0s
	5s

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