Add support for symbolic links for provisioning profiles folder

[Christian-Schulz]

If the provisioning profile folder is a symbolic link, the index file "Provisioning Profiles.index" is never recreated.

Adding or changing provisioning profiles has no effect on the last write time of the folder. Only the last write time of the target is changed.

[Christian-Schulz]

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[jstedfast]

This is only available in net6+ and is not available in netstandard2.0 or net472 (which is what we target).