universe: spin out js/yarn tests

Signed-off-by: Solomon Hykes <solomon@dagger.io>

tests/stdlib/js/yarn/testdata/package.json

@@ -1,11 +0,0 @@
-{
-  "name": "test",
-  "main": "index.js",
-  "license": {
-    "type": "Apache-2.0",
-    "url": "https://opensource.org/licenses/apache2.0.php"
-  },
-  "scripts": {
-	  "build": "mkdir -p ./build && echo output > ./build/test && touch .env && cp .env ./build/"
-  }
-}

tests/stdlib/js/yarn/yarn.cue

@@ -1,26 +0,0 @@
-package react
-
-import (
-	"dagger.io/dagger"
-	"dagger.io/js/yarn"
-	"dagger.io/alpine"
-	"dagger.io/os"
-)
-
-TestData: dagger.#Artifact
-
-TestReact: {
-	pkg: yarn.#Package & {
-		source: TestData
-	}
-
-	test: os.#Container & {
-		image: alpine.#Image & {
-			package: bash: "=5.1.0-r0"
-		}
-		mount: "/build": from: pkg.build
-		command: """
-			test "$(cat /build/test)" = "output"
-			"""
-	}
-}