Alanren/integration test (#3657)

* add an extension for integration tests

* setup ads before running test

* test setup

* test cases

* bash script

* shorter temp folder name

* code cleanup

* add commented out original code

* fix test error

* test result path

* rename results file

* change file path

* report smoke test results

* test stablize

* test stablization and configurable test servers

* fix smoke test error

* connection provider

* simplify the integration test script

* add comment

* fix tslint error

* address PR comments

* add temp log to check whether the environment variable is already set

* remove temp log

* move api definition to testapi typing file

* exclude integration tests extension

* address comments

.vscode/launch.json

@@ -152,6 +152,16 @@
 			"args": [
 				"--extensionDevelopmentPath=${workspaceRoot}/extensions/debug-auto-launch"
 			]
+		},
+		{
+			"type": "node",
+			"request": "launch",
+			"name": "Launch Smoke Test",
+			"program": "${workspaceFolder}/test/smoke/test/index.js",
+			"cwd": "${workspaceFolder}/test/smoke",
+			"env": {
+				"BUILD_ARTIFACTSTAGINGDIRECTORY": "${workspaceFolder}"
+			}
 		}
 	],
 	"compounds": [