Migrate components using Batch comments Vuex store to Pinia

...avascripts/batch_comments/components/diff_file_drafts.vue

...sets/javascripts/batch_comments/components/draft_note.vue

...ts/javascripts/batch_comments/components/drafts_count.vue

...avascripts/batch_comments/components/preview_dropdown.vue

...sets/javascripts/batch_comments/components/review_bar.vue

...javascripts/batch_comments/components/submit_dropdown.vue

app/assets/javascripts/batch_comments/index.js

app/assets/javascripts/batch_comments/store/index.js

app/assets/javascripts/batch_comments/store/state.js

...pts/batch_comments/stores/modules/batch_comments/state.js

app/assets/javascripts/diffs/components/app.vue

app/assets/javascripts/diffs/components/tree_list_height.vue

app/assets/javascripts/diffs/mixins/draft_comments.js

app/assets/javascripts/mr_notes/init.js

app/assets/javascripts/notes/components/note_form.vue

app/assets/javascripts/notes/index.js

app/assets/javascripts/notes/mixins/diff_line_note_form.js

app/assets/javascripts/pinia/instance.js

...rontend/batch_comments/components/submit_dropdown_spec.js

...pec/frontend/diffs/components/diff_line_note_form_spec.js