Add project tool coverage indicator

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183111



Merged-by: Jose Ivan Vargas <jvargas@gitlab.com>
Approved-by: Michael Fangman <mfangman@gitlab.com>
Approved-by: Thomas Randolph <trandolph@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Co-authored-by: Miranda Fluharty <mfluharty@gitlab.com>