Combine repository size information into one page

...projects/settings/repository/maintenance/remove_blobs.vue

app/assets/javascripts/usage_quotas/storage/constants.js

app/views/projects/maintenance/_cleanup.html.haml

app/views/projects/maintenance/_remove_blobs.html.haml

doc/administration/settings/account_and_limit_settings.md

doc/administration/wikis/index.md

doc/ci/environments/index.md

doc/topics/git/lfs/index.md

doc/topics/git/undo.md

doc/user/analytics/analytics_dashboards.md

...r/application_security/secret_detection/pipeline/index.md

doc/user/gitlab_com/index.md

doc/user/project/repository/index.md

...er/project/repository/reducing_the_repo_size_using_git.md

doc/user/project/repository/repository_size.md

doc/user/project/settings/import_export_troubleshooting.md

doc/user/snippets.md

doc/user/usage_quotas.md

...cripts/usage_quotas/transfer/components/usage_by_type.vue

...nd/usage_quotas/transfer/components/usage_by_type_spec.js