Support list of versions for sync-release

[mfocko]

Summary

Pass around versions in a list (for New Hotness we can have just one version in the list, for Anitya version update fail)

TODO

• [ ] Decide whether it's better fit to handle multiple versions in the handlers on service-side only, or implement it directly in the Packit API as suggested in the following points
• [ ] Adjust sync-release “API” call to be able to take list of versions instead of just one https://github.com/packit/packit/blob/d3cd78c0f90402f8b87d96ebd967cbf3d448148b/packit/api.py#L823
  • [ ] For now it makes sense to expect (can be checked with a simple assert) that only one version has been given, and take the first one
  • [ ] Follow ups to handle multiple versions will be opened later
• [ ] Adjust the CLI calls to the API to pass the list
• [ ] Adjust the packit-service calls to the API to pass the list

Notes

Affects mainly pull-from-upstream

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Part of #2068