Merge branch 'slashmanov/refactor-diff-line-note-form-spec' into 'master'

...sets/javascripts/diffs/components/diff_line_note_form.vue

app/assets/javascripts/mr_notes/stores/index.js

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

ee/spec/frontend/diffs/components/diff_view_spec.js

spec/frontend/__helpers__/init_vue_mr_page_helper.js

...frontend/diffs/components/collapsed_files_warning_spec.js

spec/frontend/diffs/components/diff_content_spec.js

spec/frontend/diffs/components/diff_expansion_cell_spec.js

spec/frontend/diffs/components/diff_file_spec.js

spec/frontend/diffs/components/diff_line_note_form_spec.js

spec/frontend/diffs/components/diff_row_spec.js

spec/frontend/diffs/components/diff_stats_spec.js

spec/frontend/diffs/mock_data/diff_file.js

spec/frontend/diffs/store/actions_spec.js

spec/frontend/diffs/store/mutations_spec.js

spec/frontend/diffs/store/utils_spec.js

spec/frontend/diffs/utils/diff_file_spec.js

spec/frontend/notes/components/noteable_discussion_spec.js