Make CI run unit tests for all packages by consolidating name of NPM script

Co-authored-by: Mikko Aspiala <mikko.aspiala@gmail.com>

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

packages/legacy-extension-example/package.json

@@ -33,7 +33,7 @@
     "clean": "rimraf dist/",
     "build": "webpack --config webpack.ts",
     "dev": "webpack --mode=development --watch --config webpack.ts",
-    "test": "jest --coverage --runInBand",
+    "test:unit": "jest --coverage --runInBand",
     "lint": "lens-lint",
     "lint:fix": "lens-lint --fix"
   },