Fixes #4321 - Cannot delete folders with Azure Multiaccount authentication

[xdelox]

Fixes #4321

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[xdelox]

I've added this IT for the sake of testing locally, I knew these ITs are temporarily disabled

[xdelox]

with this second argument, this override of the method is able to resolve custom namespaces for picking the right Filesystem provider.
I see @hansva used it all around, instead of the previous version. However I wonder if we should consider to deprecate the old method, which looks the same, for the rest.

[hansva]

There are spots where that's not possible because of chicken-egg for example loading the project and metadata can also be done via VFS but can't use the custom locations