Adds tests for new relatedIdentifierTypes and addresses changes in examples for relationTypeInformation

[codycooperross]

Purpose

Adds tests for relatedIdentifierTypes RAiD and SWHID in relatedIdentifiers.relatedIdentifierType and relatedItems.relatedItemIdentifier. relatedItemIdentifierType. Adjusts existing relationTypeInformation tests due to changes in examples.

closes: Add github issue that originated this PR

Approach

Open Questions and Pre-Merge TODOs

Learning

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

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