Value Stream Analytics: Migrate lifecycle metrics requests to apollo

Background

The lifecycle metrics for VSA are currently queried via our REST api. These metrics are also available in the grapqhl API through the work we did for for VSD.

As a part of the migration from Vuex for the VSA page we should now be able to reuse the graphql+apollo queries on the VSA page.

TODO

• Migrate the API requests for VSA lifecycle metrics to graphql + apollo app/assets/javascripts/analytics/shared/components/value_stream_metrics.vue
• Update EE/FOSS tests
• Cleanup MR to remove old REST requests