NPM packages: Fail `build-frontend-packages` step if `package.json` and input tag differ (#70011)
* Fail if package.json version is different than the tag
* Add tests
* Update message
* Small refactoring
* Fix lint
(cherry picked from commit a6b524fd56)
Co-authored-by: Dimitris Sotirakis <dimitrios.sotirakis@grafana.com>