Fix US Core demo and test files for treeshake and flat slice API #645

Job	Run time
test-typescript-us-core-example (latest)	36s
test-python-fhirpy-sdk-test (latest, 3.13)	1m 24s
test-csharp-sdk (latest, 8.0.x)	1m 30s
test-mustache-java-r4-example (latest, 25)	20s
test-mustache-java-r4-example (latest, 21)	18s
test-python-sdk-test (latest, 3.13)	1m 27s
test-typescript-ccda-example (latest)	1m 8s
test-typescript-sdk-r4 (latest)	17s
	7m 0s

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