Publish docs to latest folder

[xnyo]

Change the publish docs script to push files to a latest folder rather than vx.y.z. Related to https://github.com/grafana/website/pull/28721

plugin-ci-workflows/actions/internal/plugins/docs/publish/script.sh

Line 26 in f70e822

docs_folder="content/docs/plugins/$plugin_id/v$plugin_version"