Rename Copy-AzFileShareStorageFiles to Upload-AzFileShareStorageFiles

[stijnmoreels]

Is your feature request related to a problem? Please describe.
As the Azure Blob storage uses Upload-... for uploading raw blob contents, it seems more streamlined that we use that in the Azure File Share too.

Make sure that we mark it as obsolete, or write a warning when using the Copy-... in the next version.

[mbraekman]

Good thinking.
Perhaps let's do a phased approach?
Next release -> write a warning that Copy-... has become obsolete but still forwards the request to Upload-...
Later release -> Copy-... is actually removed

Makes it a bit more complex from a maintenance point of view, through.

[stijnmoreels]

Yes, of course, gradually!👍