Merge branch 'nfriend-add-project-lead-time-graphs' into 'master'

app/assets/javascripts/lib/utils/datetime_utility.js

.../javascripts/projects/pipelines/charts/components/app.vue

...projects/pipelines/charts/components/lead_time_charts.vue

...ects/pipelines/charts/components/static_data/lead_time.js

.../javascripts/projects/pipelines/charts/components/util.js

...elogs/unreleased/nfriend-add-project-lead-time-graphs.yml

...ts/__snapshots__/deployment_frequency_charts_spec.js.snap

...pelines/charts/components/__snapshots__/util_spec.js.snap

...nes/charts/components/deployment_frequency_charts_spec.js

...ects/pipelines/charts/components/lead_time_charts_spec.js

...rontend/projects/pipelines/charts/components/util_spec.js

locale/gitlab.pot

spec/frontend/lib/utils/datetime_utility_spec.js

...frontend/projects/pipelines/charts/components/app_spec.js