`keep_registered` and `skip_export` are mutually exclusive

Something still off with the combination of parms to get this to work

I have the following params that I believe are relevant to delivering a working VM in Hyper-V manager:
```
temp_path = "E:/Hyper-V/"
shutdown_command = "shutdown /s /t 5"
shutdown_timeout = "60s"
keep_registered = true
skip_export = true
skip_compaction = true
```
I have no `output_directory` specfied according to hints mentioned in this thread.

HyperV "Virtual Machine" files appear to remain in the build folder below `E:/Hyper-V/` - but there is no "Virtual DIsks" folder - that appears to be created in an `output-xxx` subfolder beside the HCL file.

The VM listed in HyperV manager will not start - complains about missing disk files. WHen I move the Virtual DIsk folder below the build folder, then complains about incorrect perms.

Ulitimately perhaps I'm abusing packer to create VM _instances_ rather than _images_, but then perhaps `keep_registered` and `skip_export` should not be options?

packer 1.9.4 with hyperv plugin 1.1.3

_Originally posted by @pmcevoy in https://github.com/hashicorp/packer-plugin-hyperv/issues/115#issuecomment-1836039080_