`installation-configuration.md` persists instead of deleting

[iwahbe]

What happened?

The registry fails to delete old files on an update. I believe this only applies to installation-configuration.md.

If a new update does not contain a installation-configuration.md then the old file will be left as is. It should be deleted.

Example

https://github.com/pulumi/registry/pull/6973

Output of pulumi about

NA

Additional context

No response

Contributing

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