[Ubuntu] Fix .NET SDK extraction

[lumarel]

Description

We noticed in our own builds, that the extra home repository sourced .NET SDKs are missing. This should fix that.

Fixes #10656

Related issue:

Check list

• [ ] Related issue / work item is attached
• [ ] Tests are written (if applicable)
• [ ] Documentation is updated (if applicable)
• [ ] Changes are tested and related VM images are successfully generated