The binding strength is not considered when validating resources against a profile

[codeforgreen]

Describe the bug
The changes in #6360 introduced a bug because the issue detail code for Remote Terminology $validate-code calls was set to always be invalid-code.

The org.hl7.fhir.core, more specifically org.hl7.fhir.validation library expects invalid-code to be used only for CodeSystem $validate-code and is expecting to see codes like not-in-vs for ValueSet $validate-code in cases when a code is not found in an existing ValueSet. This happens in org.hl7.fhir.validation.instance.InstanceValidator#processTxIssues.
When trying to use a profile where a binding for an element against a ValueSet is extensible, the validate operation will return an error which is not expected in this case because the code does exist in the extended profile binding.

See: https://github.com/hapifhir/org.hl7.fhir.core/blob/master/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java#L1718

To Reproduce
Steps to reproduce the behaviour:

1. Create a custom profile for Encounter resources and store it to a hapi-fhir repository:
   profile-encounter.json
2. Setup a hapi-fhir client with a validator that includes an instance of RemoteTerminologyValidationSupportService with https://r4.ontoserver.csiro.au/fhir/.

e.g.

String remoteTerminologyServerUrl = "https://r4.ontoserver.csiro.au/fhir/";
FhirContext fhirCtx = FhirContext.forR4Cached();

FhirInstanceValidator fhirInstanceValidator = new FhirInstanceValidator(fhirCtx);
ValidationSupportChain validationSupport = new ValidationSupportChain(
	new DefaultProfileValidationSupport(fhirCtx),
	new RemoteTerminologyValidationSupportService(fhirCtx, remoteTerminologyServerUrl);
);

validator.setValidationSupport(validationSupport);
FhirValidator fhirValidator = fhirCtx.newValidator();
fhirValidator.registerValidatorModule(fhirInstanceValidator);

4. Create an encounter resource instance with an identifier that should be valid according to the profile.
   e.g.

Encounter encounter = new Encounter();
encounter.getMeta().addProfile("http://example.ca/fhir/StructureDefinition/profile-encounter");
encounter.setStatus(Encounter.EncounterStatus.PLANNED);
encounter.addIdentifier()
	.getType().addCoding()
	.setSystem("http://terminology.hl7.org/CodeSystem/v2-0203")
	.setCode("VN")
	.setDisplay("Visit number");

6. Validate the resource (runtime resource, no need to store it in the hapi-fhir repository) and check the errors which relate to code VN

IGenericClient fhirClient = fhirCtx.newRestfulGenericClient("http://localhost:8000");

MethodOutcome resultProcedure = fhirClient.validate().resource(theResource).execute();
OperationOutcome operationOutcome = (OperationOutcome) resultProcedure.getOperationOutcome();
String output = fhirCtx.newJsonParser().setPrettyPrint(true).encodeResourceToString(operationOutcome);

7. You will notice the following issue with severity error:
   The provided code 'http://terminology.hl7.org/CodeSystem/v2-0203#VN' was not found in the value set 'http://hl7.org/fhir/ValueSet/identifier-type|5.0.0-ballot'

Expected behaviour
No error should be returned since the profile http://hl7.org/fhir/StructureDefinition/Identifier which is in the hierarchy states that element Identifier.type has an extensible binding and the code VN exists in CodeSystem http://terminology.hl7.org/CodeSystem/v2-0203 which is the extended binding in the profile created at step 1.

Environment (please complete the following information):

• HAPI FHIR Version 7.4.4