Docs fix the `storybook-manager-events.js`, which is used for `google tag manager`.

[gfellerph]

          We need to fix the `storybook-manager-events.js`, which is used for `google tag manager`.

Originally posted by @oliverschuerch in https://github.com/swisspost/design-system/pull/2797#pullrequestreview-1938595843

[oliverschuerch]

This will only become a problem, when we update to storybook 8.