Migrate `app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/index.js` to Pinia
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=555263) </details> <!--IssueSummary end--> [`app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/index.js`]() store should be migrated to Pinia using [the single-step migration](https://docs.gitlab.com/development/fe_guide/pinia/#single-step-migration). Files to cover (non-exhaustive): - `app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/index.js` - `app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/actions.js` - `app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/getters.js` - `app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/mutations.js` - `app/assets/javascripts/vue_merge_request_widget/stores/artifacts_list/state.js` - `app/assets/javascripts/vue_merge_request_widget/components/artifacts_list_app.vue` And their respective specs.
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