Backend: Validate only agent and flows with at least 1 released version can be made public

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Problem

There should be no public AI catalog items that do not have a released version.

There are a couple of reasons for this at least:

• There is logic around versioning that prohibits a version from being changed once it has been released. While the only version is a draft, it can be changed at any time
• Flows that do not have a released version will not be able to be enabled #566007

Proposal

Add a validation to Item that it needs at least 1 released version before it can be made public