Fix a regression in Valueset Expansion

[tadgh]

A regression was introduced in #5969 causing ValueSet expansions where the property was non-standard, and the op was is-a, which caused a failure to expand. e.g. such a valueset.

{
	"resourceType": "ValueSet",
	"status": "active",
	"name": "StandardLabObsQuantitative_VSET",
	"id": "standard-lab-obs-quant-vs",
	"title": "Standard Lab Obs Quantitative value set",
	"description": "A set of LOINC codes for quantitative lab tests.",
	"version": "1.0.0",
	"url": "https://fhir.graphitehealth.io/release/4.0.1/Profiles/ValueSet/standard-lab-obs-quant-vs",
	"compose": {
		"include": [
			{
				"system": "http:https://hl7.org/fhir/CodeSystem/example",
				"filter": [
					{
						"property": "SCALE_TYP",
						"op": "is-a",
						"value": "Qn"
					}
				]
			}
		]
	}
}

Would result in HAPI-2526. This patch modifies a test valueset to exercise this failure via the testCodeInLargeValueSet method, and also corrects the incomplete switch statement.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.47%. Comparing base (497b9f2) to head (94c25d3).
Report is 87 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5993      +/-   ##
============================================
+ Coverage     83.39%   83.47%   +0.07%     
- Complexity    26927    27171     +244     
============================================
  Files          1681     1695      +14     
  Lines        103965   105042    +1077     
  Branches      13189    13302     +113     
============================================
+ Hits          86702    87680     +978     
- Misses        11613    11668      +55     
- Partials       5650     5694      +44     

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