Support switching from a file to a directory in a sync

[orta]

Hi folks, I had an interesting issue where a file transitioned to a directory (a trade-off of some underlaying tooling) which failed a web deploy.

I'm not sure if this is something you'd consider supporting - but I thought it was at least worth bringing up as it felt like something like I would have expected to work.

Error: The target file "D:\home\site\wwwroot\docs\handbook\writing-declaration-files.html" is a directory, not a file.

KuduSync.NET from: 'D:\home\site\repository' to: 'D:\home\site\wwwroot'
Copying file: 'docs\handbook\writing-declaration-files.html'
Failed exitCode=1, command="kudusync" -v 50  -f "D:\home\site\repository" -t "D:\home\site\wwwroot" -n "D:\home\site\deployments\d05a2ce67eeb43eb7b1efb61d5add7bca7afa673\manifest" -p "D:\home\site\deployments\871b18365dbe5f2e572dbb5043fdf3de61c3af69\manifest" -i ".git;.hg;.deployment;deploy.cmd"
An error has occurred during web site deployment.
Error: The target file "D:\home\site\wwwroot\docs\handbook\writing-declaration-files.html" is a directory, not a file.\r\nD:\Program Files (x86)\SiteExtensions\Kudu\85.11226.4297\bin\Scripts\starter.cmd "D:\home\site\deployments\tools\deploy.cmd"