add test case for cli show pfcwd stat#14711

StormLiangMS merged 3 commits intosonic-net:mastersonic-net/sonic-mgmt:masterfrom

lipxu:20240924_publicMaster_pfcwdCLIlipxu/sonic-mgmt-lipxu-fork:20240924_publicMaster_pfcwdCLICopy head branch name to clipboard