NPA-6029: Spec change to ensure PDSName is mirroring implementation (#280)

# Pull Request

## 🧾 Ticket Link

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https://nhsd-jira.digital.nhs.uk/browse/NPA-6029

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## 📄 Description/Summary of Changes

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- Removed family for PDS name as a required field
- Added text property for PDS name

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Author: ellie-bound1-NHSD

specification/validated-relationships-service-api.yaml

@@ -2523,7 +2523,6 @@ components:
         type: object
         required:
           - use
-          - family
         additionalProperties: false
         properties:
           id:
@@ -2584,6 +2583,9 @@ components:
             description: Name suffices and postnominals.
             items:
               type: string
+          text:
+            type: string
+            description: Text representation of the full name
 
     PDSBirthDate:
       description: |