do not throw an error when composing stories without play functions

[skratchdot]

This is related to #25877 and #25943

What I did

Now every story returned from a composeStory or composeStories has a play function, so end-users can no longer do a if (typeof Story.play === 'function') {} check to figure out if they can call play. When calling play- an error is thrown.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

This is related to composeStory and composeStories functionality, so I'm not sure what to manually test

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

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  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
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  • feature request: Introducing a new feature.
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[valentinpalkovic]

Hi @skratchdot

Thank you so much for this PR. This is a kind of duplicate of #25974 where we try to fix it differently and probably more correctly.

I will close this one. Let me know if you have concerns about the other solution.