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

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

Files to cover (non-exhaustive):

• app/assets/javascripts/merge_conflicts/store/index.js
• app/assets/javascripts/merge_conflicts/store/actions.js
• app/assets/javascripts/merge_conflicts/store/getters.js
• app/assets/javascripts/merge_conflicts/store/mutations.js
• app/assets/javascripts/merge_conflicts/store/state.js
• app/assets/javascripts/merge_conflicts/merge_conflicts_bundle.js
• app/assets/javascripts/merge_conflicts/merge_conflict_resolver_app.vue
• app/assets/javascripts/merge_conflicts/components/diff_file_editor.vue
• app/assets/javascripts/merge_conflicts/components/inline_conflict_lines.vue
• app/assets/javascripts/merge_conflicts/components/parallel_conflict_lines.vue

And their respective specs.