NickAkhmetov/CAT-974 Fix parent UUID handling for multi-vitessce conf datasets

[NickAkhmetov]

Summary

This PR fixes an issue introduced in #3570. Since the parent UUID was being added as a property on the array object, Array.isArray was no longer picking up the resulting object as an array. This PR adjusts the approach so that the parent UUID is properly passed down to the configs themselves.

Design Documentation/Original Tickets

https://hms-dbmi.atlassian.net/browse/CAT-974

Testing

Manually tested.

Screenshots/Video

Checklist

• [x] Code follows the project's coding standards
  • [x] Lint checks pass locally
  • [x] New CHANGELOG-your-feature-name-here.md is present in the root directory, describing the change(s) in full sentences.
• [x] Unit tests covering the new feature have been added
• [x] All existing tests pass
• [x] Any relevant documentation in JIRA/Confluence has been updated to reflect the new feature
• [x] Any new functionalities have appropriate analytics functionalities added

Additional Notes

Please specify any additional information or context relevant to this PR.