fix(ui5-user-settings): correct usage with scoping

[pskelin]

comparing strings to .tagName won't work when tags are scoped. This change introduces a new helper hasTag that checks the pureTag from the component definition.

import { hasTag } from "@ui5/webcomponents-base";
if (hasTag(element, "ui5-button")) {
  // to something
}

[ui5-webcomponents-bot]

🚀 Deployed on https://pr-12961--ui5-webcomponents-preview.netlify.app

[pskelin]

fixed with #12983