Part of epic: https://gitlab.com/groups/gitlab-org/-/epics/9692 After https://gitlab.com/gitlab-org/gitlab/-/issues/388918 is completed. ### Problem https://gitlab.com/gitlab-org/gitlab/-/issues/388918 introduced a new field (LoC count) in CommitLanguages RPC. We need to display this data on UI. ### Proposal * Fetch the LoC data from CommitLanguages RPC * Add this data to Ruby methods (consult with ~frontend devs): * https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/helpers/repository_languages_helper.rb * https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/views/projects/graphs/charts.html.haml