[full-ci] fix: initial space preloading performance

[kulmann]

Description

This PR reduces the initial space preloading to only loading personal and project spaces. The virtual/shares space (share jail) is never needed and hence never loaded. The mountpoint spaces will be loaded on demand for now. This has some drawbacks (see comment in the code) but is necessary for performance tuning at the moment. Initially preloading the mountpoints might come back at a later point. Preloading the share jail makes no sense, as web doesn't use it, and will not be reintroduced.

Motivation and Context

Tuning performance and backend load, especially when a lot of users sign in at the same time.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

4.3% Coverage
0.0% Duplication