Babel: use babel-loader instead of ts-loader, ng-annotate with babel-plugin-angularjs-annotate (#21554)

* Applied prettier to some webpack configs

* Removed ng-annotate

… and used same annotation approach as webpack.hot.js

* Removed redundant import

… that is problematic with Babel's module resolver

* Updated lockfile

* Replace ts-loader with babel-loader in webpack.dev

* Change tslint-loade order in dev webpack config

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>