NIAD-3220: Add Resource filter to identify "ReferralRequest to ExternalDocument LinkSets"

[MartinWheelerMT]

What

• Add Test to check verify that the provided LinkSet is a "Referral Request to External Document LinkSet."
• Add test XML file containing a "Referral Request to External Document LinkSet."
• Add method isReferralRequestToExternalDocumentLinkSet to ResourceFilterUtil with parameters for the EhrExtract and the LinkSet itself to identify LinkSets matching the criteria for a "Referral Request to External Document LinkSet."

Why

As part of the implementation for NIAD-3220, it is necessary to identify LinkSets which are a "Referral Request to External Document LinkSet" in order to be able to then use this for filtering in the ConditionMapper to exclude the Condition from being mapped, and in ReferralRequest mapper to identify any of these LinkSets when populating the supportingInfo field.

A "ReferralRequest to ExternalDocument LinkSet" is defined as a LinkSet which matches the following criteria:

• It has a code with a value of 394776006 and a system of 2.16.840.1.113883.2.1.3.2.4.15 and no qualifier and no originalText
• The conditionNamed / namedStatementRef / id[root] is a RequestStatement
• It has at least 1 component
• All the component / statementRef / id[root] are references to GP2GP document/attachments.

Type of change

Please delete options that are not relevant.

• Internal change (non-breaking change with no effect on the functionality affecting end users)

Checklist:

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users
• A corresponding change has been made to the Mapping Documentation repository