[be] Simplify yarn test

Updates our scripts to only hash and clean up`dist` when bundling for Meta, 
since we don't need to do that for tests.

compiler/forget/package.json

@@ -8,11 +8,12 @@
     "src"
   ],
   "scripts": {
-    "build": "rimraf dist && tsc && scripts/hash-dist.sh",
+    "build": "rimraf dist && tsc",
     "bundle:meta": "scripts/bundle-meta.sh",
     "dev": "concurrently --kill-others \"tsc --watch\" \"yarn:playground\"",
+    "hash": "scripts/hash-dist.sh",
     "playground": "cd packages/playground && yarn && yarn dev",
-    "test": "yarn build && jest",
+    "test": "tsc && jest",
     "ts:analyze-trace": "scripts/ts-analyze-trace.sh",
     "test262": "yarn run --silent test262-harness --preprocessor=scripts/test262-preprocessor.js",
     "test262:all": "yarn run --silent test262 'test262/test/**/*.js'",