Drag & drop to upload to Azurite doesn't really drop the files/blobs

[jinglouMSFT]

Reported by PaulYuk.

Repro:

go to Azure panel in VS Code
Workspace-> Local Emulator -> Blob containers -> images
open images in explorer (new window)
drag and drop from Finder or Windows Explorer into that container
It sees files and looks uploaded. but then you can't open image, or in code/streams

Same steps, but with Azure storage account, all is Good.

I was able to reproduce this. The workaround is to use the context menu to upload/download. It's likely we didn't wire up drag & drop if/when Azurite is used. Not sure if technically it's feasible. Need some investigations.