MC-36456: union implementation

[cpartica]

Description (*)

Related Pull Requests

https://github.com/magento/partners-magento2b2b/pull/216
https://github.com/magento/partners-magento2-infrastructure/pull/30

Fixed Issues (if relevant)

1. Fixes Implement unions in GQL #29425

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

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