Potential Dangling Pointers in createTree Function

[coderabbitai]

As discussed in PR #3729, there is a potential issue with storing addresses of loop variables in the createTree function, which could lead to dangling pointers if spacePoints gets modified or goes out of scope. Addressing this issue would involve major changes in several parts of the ACTS project and is out of scope for PR #3729. This issue is opened to track the work required to resolve this in a future PR.\n\nRequester: @CarloVarni

[github-actions]

This issue/PR has been automatically marked as stale because it has not had recent activity. The stale label will be removed if any interaction occurs.