Bump targets for test/automation and test/integration (microsoft#165298)

Also enables strict mode for test/integration since it only had strict null checks previously

Author: mjbvz

test/automation/tsconfig.json

@@ -1,15 +1,15 @@
 {
 	"compilerOptions": {
 		"module": "commonjs",
-		"target": "es2017",
+		"target": "es2020",
 		"strict": true,
 		"noUnusedParameters": false,
 		"noUnusedLocals": true,
 		"outDir": "out",
 		"sourceMap": true,
 		"declaration": true,
 		"lib": [
-			"es2016",
+			"es2020",
 			"dom"
 		]
 	},

test/integration/browser/tsconfig.json

@@ -4,14 +4,14 @@
 		"noImplicitAny": false,
 		"removeComments": false,
 		"preserveConstEnums": true,
-		"target": "es2017",
-		"strictNullChecks": true,
+		"target": "es2020",
+		"strict": true,
 		"noUnusedParameters": false,
 		"noUnusedLocals": true,
 		"outDir": "out",
 		"sourceMap": true,
 		"lib": [
-			"es2016",
+			"es2020",
 			"dom"
 		]
 	},