Add general component for instance statistics
count charts to be reused, so the user can both
see issues and merge request data as well as
pipeline statistics. This will also be useful for
other charts on the same page.

Refs:
https://gitlab.com/gitlab-org/gitlab/-/issues/267538
https://gitlab.com/gitlab-org/gitlab/-/issues/246491
https://gitlab.com/gitlab-org/gitlab/-/issues/268224
https://gitlab.com/gitlab-org/gitlab/-/issues/267997
https://gitlab.com/gitlab-org/gitlab/-/issues/233854