[Spaces] Exclude disabled Spaces from initial sync

[michaelstingl]

Pre-submission Checks

• [X] I checked for similar issues, but could not find any. I also checked the closed issues. I could not contribute additional information to any existing issue.
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Feature description

Spaces can be "disabled". At least at initial sync, we should exclude them. (no concept for Spaces that get disabled or deleted later yet)

Proposed solution

Exclude disabled Spaces from initial sync.

Alternative solutions you considered

No response

Additional context

No response

[TheOneRing]

Handling spaces that get disabled after they where added is not possible in the scope of 3.0. Prevent them from being added in the first place is another thing, and can be done for 3.0.

[fmoc]

Fixed by #10244.