Merge branch '323984-vsa-remove-custom-stages-module' into 'master'

...javascripts/analytics/cycle_analytics/components/base.vue

...nalytics/cycle_analytics/components/value_stream_form.vue

...ts/javascripts/analytics/cycle_analytics/store/actions.js

...sets/javascripts/analytics/cycle_analytics/store/index.js

...cs/cycle_analytics/store/modules/custom_stages/actions.js

...cs/cycle_analytics/store/modules/custom_stages/getters.js

...tics/cycle_analytics/store/modules/custom_stages/index.js

...e_analytics/store/modules/custom_stages/mutation_types.js

.../cycle_analytics/store/modules/custom_stages/mutations.js

...tics/cycle_analytics/store/modules/custom_stages/state.js

...scripts/analytics/cycle_analytics/store/mutation_types.js

.../javascripts/analytics/cycle_analytics/store/mutations.js

...sets/javascripts/analytics/cycle_analytics/store/state.js

ee/app/assets/javascripts/analytics/cycle_analytics/utils.js

ee/app/assets/javascripts/api.js

...tics/cycle_analytics/components/value_stream_form_spec.js

ee/spec/frontend/analytics/cycle_analytics/mock_data.js

.../frontend/analytics/cycle_analytics/store/actions_spec.js

...cle_analytics/store/modules/custom_stages/actions_spec.js

...cle_analytics/store/modules/custom_stages/getters_spec.js