Replace Lerna with Nx release

Lerna is the original tool for version management and publishing of NPM packages in frontend monorepos. It's served us well but lacks one major feature - the ability to version different groups of NPM packages with different versioning strategies. This has prevented developers from adding packages (that are well suited to live within the Grafana project) due to having to wait on a Grafana release for publishing and having to stick to the same versions as the Grafana release. With the release of Nx 18 comes the release commands and this missing functionality. Once lerna is replaced we will be able to add NPM packages to grafana/grafana, set specific release groups, and then version and publish with a different versioning strategy to core Grafana. Lerna is used in multiple repos. We need to make sure that we make the necessary updates to: - https://github.com/grafana/grafana-github-actions - https://github.com/grafana/grafana-build - https://github.com/grafana/grafana (There could be more places but these are the ones I'm aware of as of writing.)