Adding request execution delay when placeholder mode in enabled in a Kubernetes environment (#8532)

* Adding request execution delay when placeholder mode in enabled in a Kubernetes environment

* Update WebJobsApplicationBuilderExtension.cs

Author: liliankasem

src/WebJobs.Script.WebHost/WebJobsApplicationBuilderExtension.cs

@@ -36,7 +36,7 @@ public static IApplicationBuilder UseWebJobsScriptHost(this IApplicationBuilder
             builder.UseMiddleware<HttpRequestBodySizeMiddleware>();
             builder.UseMiddleware<SystemTraceMiddleware>();
             builder.UseMiddleware<HostnameFixupMiddleware>();
-            if (environment.IsLinuxConsumption())
+            if (environment.IsLinuxConsumption() || environment.IsKubernetesManagedHosting())
             {
                 builder.UseMiddleware<EnvironmentReadyCheckMiddleware>();
             }
@@ -99,4 +99,4 @@ public static IApplicationBuilder UseWebJobsScriptHost(this IApplicationBuilder
             return builder;
         }
     }
-}
+}