Protect the space metafiles.

[2403905]

Describe the bug

Protect the hidden space metafiles .space and .space/readme.md from deleting or moving.
Based on rejected issue #8719 we want to merge the already implemented useful part.

Expected behavior

A clear and concise description of what you expected to happen.

Actual behavior

A clear and concise description of what happened.

Setup

Please describe how you started the server and provide a list of relevant environment variables or configuration files.

OCIS_XXX=somevalue
OCIS_YYY=somevalue
PROXY_XXX=somevalue

Additional context

Add any other context about the problem here.