Refactor(createFlash): use non-deprecated function

app/assets/javascripts/api/user_api.js

app/assets/javascripts/awards_handler.js

...s/batch_comments/stores/modules/batch_comments/actions.js

app/assets/javascripts/behaviors/markdown/render_mermaid.js

app/assets/javascripts/behaviors/preview_markdown.js

app/assets/javascripts/blob/balsamiq_viewer.js

app/assets/javascripts/blob/file_template_mediator.js

app/assets/javascripts/blob/openapi/index.js

app/assets/javascripts/blob/viewer/index.js

...assets/javascripts/boards/components/new_list_dropdown.js

app/assets/javascripts/boards/models/list.js

app/assets/javascripts/clusters/clusters_bundle.js

app/assets/javascripts/clusters_list/store/actions.js

app/assets/javascripts/contributors/stores/actions.js

app/assets/javascripts/create_cluster/gke_cluster/index.js

app/assets/javascripts/deploy_keys/components/app.vue

app/assets/javascripts/diff.js

.../javascripts/environments/components/environments_app.vue

...ets/javascripts/environments/mixins/environments_mixin.js

...javascripts/feature_highlight/feature_highlight_helper.js