Migrate spec/javascripts/notes/ to Jest

The following test files should be refactored from Karma to Jest:

find spec/javascripts/notes -name '*_spec.js' -exec echo "- [ ] {}" \;

• spec/javascripts/notes/stores/mutation_spec.js
• spec/javascripts/notes/stores/getters_spec.js
• spec/javascripts/notes/stores/collapse_utils_spec.js
• spec/javascripts/notes/stores/actions_spec.js
• spec/javascripts/notes/components/noteable_discussion_spec.js
• spec/javascripts/notes/components/diff_with_note_spec.js
• spec/javascripts/notes/components/discussion_reply_placeholder_spec.js
• spec/javascripts/notes/components/note_signed_out_widget_spec.js
• spec/javascripts/notes/components/noteable_note_spec.js
• spec/javascripts/notes/components/comment_form_spec.js
• spec/javascripts/notes/components/discussion_resolve_button_spec.js
• spec/javascripts/notes/components/note_body_spec.js
• spec/javascripts/notes/components/note_awards_list_spec.js
• spec/javascripts/notes/components/discussion_filter_spec.js
• spec/javascripts/notes/components/note_form_spec.js
• spec/javascripts/notes/components/note_edited_text_spec.js
• spec/javascripts/notes/components/note_app_spec.js
• spec/javascripts/notes/components/note_attachment_spec.js
• spec/javascripts/notes/components/discussion_filter_note_spec.js
• spec/javascripts/notes/components/toggle_replies_widget_spec.js
• spec/javascripts/notes/components/note_header_spec.js
• spec/javascripts/notes/components/note_actions/reply_button_spec.js
• spec/javascripts/notes/components/discussion_resolve_with_issue_button_spec.js
• spec/javascripts/notes/components/note_actions_spec.js
• spec/javascripts/notes/components/discussion_counter_spec.js