Remove phantomjs #2324
Description
Phantomjs was suspended and archived some years ago, it doesn't appear to be actually used in this project, and karma throws an error about it when running the tests:
14 08 2025 16:17:51.980:ERROR [plugin]: Error during loading "karma-phantomjs-launcher" plugin:
The "path" argument must be of type string. Received null
phantomjs-prebuilt and karma-phantomjs-launcher needs to be removed from package.json, and the plugin removed from the list in karma.conf.js.