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

extensions/integration-tests/.vscode/launch.json

@@ -0,0 +1,17 @@
+// A launch configuration that compiles the extension and then opens it inside a new window
+{
+	"version": "0.1.0",
+	"configurations": [
+		{
+			"name": "Launch Tests",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": ["${workspaceFolder}/../../", "${workspaceFolder}/test", "--extensionDevelopmentPath=${workspaceFolder}", "--extensionTestsPath=${workspaceFolder}/out" ],
+			"stopOnEntry": false,
+			"sourceMaps": true,
+			"outDir": "${workspaceFolder}/out",
+			"preLaunchTask": "npm"
+		}
+	]
+}