further improve repo setup

package-lock.json

@@ -12500,10 +12500,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/testing": {
-      "resolved": "packages/testing-browser",
-      "link": true
-    },
     "node_modules/text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -13269,7 +13265,8 @@
     },
     "packages/testing-browser": {
       "name": "testing",
-      "version": "0.0.0"
+      "version": "0.0.0",
+      "extraneous": true
     },
     "packages/workspace-root": {
       "name": "package-root",
@@ -22377,9 +22374,6 @@
         "minimatch": "^3.0.4"
       }
     },
-    "testing": {
-      "version": "file:packages/testing-browser"
-    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",