Create release info dashboard with monthly release status panels

For issue gitlab-com/gl-infra/delivery#19990 (closed) to create a release info dashboard with monthly release status panels.

It has been PoC'd here previously: playground link, screenshots

Temporary snapshot link (24 hours)

If the above link isn't available, check out the branch, and run the following command in the dashboards folder (setup instructions in dashboards/README.md):

./test-dashboard.sh delivery/release_info.dashboard.jsonnet