Nit: update azdo job name for macOS (#20330)

Author: John Luo

.azure/pipelines/ci.yml

@@ -558,7 +558,7 @@ stages:
     parameters:
       condition: ne(variables['SkipTests'], 'true')
       jobName: MacOS_Test
-      jobDisplayName: "Test: macOS 10.13"
+      jobDisplayName: "Test: macOS 10.14"
       agentOs: macOS
       isTestingJob: true
       buildArgs: --all --test "/p:RunTemplateTests=false" $(_InternalRuntimeDownloadArgs)