fix recurring event error

[ETLaurent]

PRO-2827 PRO-2756

Summary

When saving an event that's configured to be recurring several times a week or a month, an error occurs. To fix that, attach a new generated workflowGuid to the cloned events (which are inserted as many times as the event is recurring).

What are the specific steps to test this change?

• link apostrophe-events module to a website that uses A2.
• in the website, login and create a recurring event
• save

No error should occur and new events matching the recurring dates should have been created.

What kind of change does this PR introduce?

(Check at least one)

• [x] Bug fix
• [ ] New feature
• [ ] Refactor
• [ ] Documentation
• [ ] Build-related changes
• [ ] Other

Make sure the PR fulfills these requirements:

• [x] It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• [x] The changelog is updated
• [ ] Related documentation has been updated
• [ ] Related tests have been updated

If adding a new feature without an already open issue, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[linear[bot]]

PRO-2827 Error occurs when I try to save a recurring event.

[https://tomtest-howto-2.preprod.kimpton.apos.dev/](https://tomtest-howto-2.preprod.kimpton.apos.dev/private)login admin / demo To reproduce: * Create an event and add an image (not sure if this is relevant) * Select recurring in Advanced and fill out date details * Save