Remove feature flag for worker warmup (#9317)

Author: shreyas-gopalakrishna

src/WebJobs.Script.WebHost/Middleware/HostWarmupMiddleware.cs

@@ -88,10 +88,7 @@ public async Task WarmupInvoke(HttpContext httpContext)
 
         private async Task WorkerWarmupAsync()
         {
-            if (_hostingConfigOptions.Value.WorkerWarmupEnabled)
-            {
-                await _webHostRpcWorkerChannelManager.WorkerWarmupAsync();
-            }
+            await _webHostRpcWorkerChannelManager.WorkerWarmupAsync();
         }
 
         internal void ReadRuntimeAssemblyFiles()

src/WebJobs.Script/Config/FunctionsHostingConfigOptions.cs

@@ -32,17 +32,6 @@ public bool FunctionsWorkerDynamicConcurrencyEnabled
             }
         }
 
-        /// <summary>
-        /// Gets a value indicating whether language workers warmup feature is enabled in the hosting config.
-        /// </summary>
-        public bool WorkerWarmupEnabled
-        {
-            get
-            {
-                return GetFeature(RpcWorkerConstants.WorkerWarmupEnabled) == "1";
-            }
-        }
-
         /// <summary>
         /// Gets a value indicating whether worker indexing feature is enabled in the hosting config.
         /// </summary>