Migrate app/assets/javascripts/user_lists/store/index/index.js to Pinia

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app/assets/javascripts/user_lists/store/index/index.js store should be migrated to Pinia using the single-step migration.

Files to cover (non-exhaustive):

• app/assets/javascripts/user_lists/store/index/index.js
• app/assets/javascripts/user_lists/store/index/actions.js
• app/assets/javascripts/user_lists/store/index/mutations.js
• app/assets/javascripts/user_lists/store/index/state.js
• app/assets/javascripts/user_lists/components/edit_user_list.vue
• app/assets/javascripts/pages/projects/feature_flags_user_lists/index/index.js

And their respective specs.