Chore: fix canvas test runner (#23336)

Blocked by #23342

This fixes the local test runner in Canvas. It should not affect anything else, including the CI test runner.

- Bumps JSDOM to ^12.0.0
  - I matched Kibana's version on migration, but nothing else in X-Pack uses JSDOM, so we can use the newer version (which has a very different API)
  - I had to match it because of a script that enforces version matching, but #23342 removed jsdom from Kibana, so we no longer have a version to match
- Restores the local `.babelrc` file
  - I thought it was only used for building plugins; I was wrong 😢

x-pack/package.json

@@ -58,7 +58,7 @@
     "jest": "^23.5.0",
     "jest-cli": "^23.5.0",
     "jest-styled-components": "^6.1.1",
-    "jsdom": "9.9.1",
+    "jsdom": "^12.0.0",
     "mocha": "3.3.0",
     "mustache": "^2.3.0",
     "mutation-observer": "^1.0.3",

x-pack/plugins/canvas/.babelrc

@@ -0,0 +1,18 @@
+{
+	"plugins": [
+		"transform-object-rest-spread",
+		"transform-async-to-generator",
+		"transform-class-properties"
+	],
+	"presets": [
+		"react",
+		[
+		"env",
+		{
+			"targets": {
+				"node": "current"
+			}
+		}
+		]
+	]
+}

x-pack/plugins/canvas/tasks/helpers/dom_setup.js

@@ -15,6 +15,7 @@ const { window } = new JSDOM('', {
   url: `http://localhost:5601/${basename}`,
   pretendToBeVisual: true,
 });
+
 global.window = window;
 global.document = window.document;
 global.navigator = window.navigator;