NPA-4334: specify package mode

Author: LeoKHoward

pyproject.toml

@@ -10,6 +10,7 @@ license = "MIT"
 repository = "https://github.com/NHSDigital/validated-relationships-service-api"
 homepage = "https://digital.nhs.uk/developer/api-catalogue"
 keywords = ["healthcare", "uk", "nhs"] #TODO add additional keywords
+package-mode = false
 
 [tool.poetry.dependencies]
 python = "^3.12"