remove k8s configs, update worker for multi-languages support, add local-submit option

src/LiquidCode.Tester.Gateway/appsettings.json

@@ -8,9 +8,10 @@
   "AllowedHosts": "*",
   "PackageDownloadDirectory": "/tmp/packages",
   "Workers": {
-    "Cpp": "http://liquidcode-tester-worker-cpp:8080",
-    "Java": "http://liquidcode-tester-worker-java:8080",
-    "Kotlin": "http://liquidcode-tester-worker-kotlin:8080",
-    "CSharp": "http://liquidcode-tester-worker-csharp:8080"
+    "Cpp": "http://localhost:8081",
+    "Java": "http://localhost:8081",
+    "Kotlin": "http://localhost:8081",
+    "CSharp": "http://localhost:8081",
+    "Python": "http://localhost:8081"
   }
 }