Func new fails with DurableTask.AzureStorage.dll already exists

cc @soninaren

Core Tools version: `3.0.3388`

`func new` fails with error : One or more errors occurred. (The file `'C:\Users\pgopa\AppData\Local\Temp\Functions\ExtensionBundles\Microsoft.Azure.Functions.ExtensionBundle\1.5.1\bin\DurableTask.AzureStorage.dll' already exists.)`

Work around:
Delete folder : `C:\Users\pgopa\AppData\Local\Temp\Functions\ExtensionBundles\Microsoft.Azure.Functions.ExtensionBundle\1.5.1`

Start by reproducing `func new` with Core Tools 3.0.3388 and inspect the extension-bundle directory under the reported Temp\Functions path. Trace why `DurableTask.AzureStorage.dll` is treated as an existing file during bundle setup. Done means `func new` completes without the duplicate-file error and the extension bundle remains usable.

Written by the indexing model from the issue text.