[5947] Add support for publishing libraries from non-main editing context

[gdaniel]

Bug: #5947
Fixes #5947

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[gdaniel]

I am wondering if this is a good idea.
We can maybe still use the projectId as the namespace to ensure all the libraries published from the same project are published in the same namespace.

[gdaniel]

Looking back at it, it doesn't make sense to use the editingContextId as namespace of a library.
It should still be the projectId, even if the PublishLibrariesInput gives the editingContextId.
I'll fix that.

[gdaniel]

Done.
Note that it is the StudioLibraryPublicationListener that is in charge of retrieving the projectId. This means that if, somehow, someone attempts to publish a library from an editing context not contained in a project, the StudioLibraryPublicationHandler will create the library SemanticData, but the Library itself won't be created.

I don't know if I need to do anything else in this PR (e.g. compute the namespace in the handler and pass it to the listener via StudioLibrarySemanticDataCreationRequested) , or if fixing #6075 will be good enough to ensure we never reach this state.

[sbegaudeau]

I think it's good for the scope of this PR

[gdaniel]

We should also keep the projectId here: we want a stable identifier for the shared_components resource, it should remain stable if the resource has been published from one editing context or another.

[gdaniel]

Done

[sbegaudeau]

This looks good, I'll merge it this week