Remove empty transform file. (#20368)
This file was added in dotnet/runtime#41913. It causes git to refuse to check out master on Windows without disabling the `core.protectNTFS` config and when checked out on an NTFS drive, is automatically renamed to not have a period at the end, resulting in a change that renames the file to `transform` always being present in the working directory.
These both cause headaches with the developer inner loop.
Co-authored-by: jkoritzinsky <jkoritzinsky@users.noreply.github.com>