[v3.x] Update WebJobsScriptHostService to remove hardcoded sleep during shut down (#9521)

Author: liliankasem

release_notes.md

@@ -6,3 +6,5 @@
 
 **Release sprint:** Sprint 146
 [ [bugs](https://github.com/Azure/azure-functions-host/issues?q=is%3Aissue+milestone%3A%22Functions+Sprint+146%22+label%3Abug+is%3Aclosed) | [features](https://github.com/Azure/azure-functions-host/issues?q=is%3Aissue+milestone%3A%22Functions+Sprint+146%22+label%3Afeature+is%3Aclosed) ]
+
+- Update WebJobsScriptHostService to remove hardcoded sleep during application shut down (#9521)

src/WebJobs.Script.WebHost/WebJobsScriptHostService.cs

@@ -793,8 +793,6 @@ private void RegisterApplicationLifetimeEvents()
                     {
                         _logger.LogDebug("Application Stopping: initiate drain mode");
                         drainModeManager.EnableDrainModeAsync(CancellationToken.None);
-                        // Workaround until https://github.com/Azure/azure-functions-host/issues/7188 is addressed.
-                        Thread.Sleep(TimeSpan.FromMinutes(10));
                     }
                 }
             });