refact(pcf): Remove duplicate HTTP status code definition and used enum class

src/api-server/impl/IndividualSMPolicyDocumentApiImpl.cpp

src/api-server/impl/SMPoliciesCollectionApiImpl.cpp

src/common/3gpp_29.500.h

src/common/pcf.h

src/pcf_app/pcf_client.cpp

src/pcf_app/pcf_client.hpp

src/pcf_app/pcf_nrf.cpp