"az keyvault secret download --file" should allow for overwriting of existing files

[dvasdekis]

Related command
az keyvault secret download

Is your feature request related to a problem? Please describe.
When running az keyvault secret download --file "this" ... multiple times, there's no option to overwrite the existing file. Instead, the command fails if the file exists.

Describe the solution you'd like
An extra flag (e.g. --overwrite) that allows for the file produced by the command to be overwritten, if it exists.

Describe alternatives you've considered
Adding commands inline to delete the file if it exists breaks the portability of scripts between Windows and Linux, as these commands are different on the two platforms.

Additional context
Example that fails is: az keyvault secret download --file "my.pfx" --name "secretname" --subscription "mysubscription" --vault-name "mykeyvault" which returns:
File or directory named 'my.pfx' already exists.

[yonzhan]

Thank you for opening this issue, we will look into it.