The group 'configure' was renamed to 'environments'

Feature categories dependency_scanning and license_compliance replaced
by software_composition_analysis, according to commit
https://gitlab.com/gitlab-com/www-gitlab-com/-/commit/e1ea6909e4824563bbc176b1fd97d1c7ea977818

  - Make product_stage requried in
  metric defintions
 - Update stage in metrics definitions

  - Use milestone <13.9 for metrics definitions
  with no milestone defined

This adds `data_category: Optional` for all metric definitions except
the set of definitions that are meant to be part of the Standard
category: `uuid`, `hostname`, `license_subscription_id`, `license_md`.

  - Import remaining metrics definitions
  - Generate metrics dictionary