This PR adds a toggleable filter to the stack frame list that filters
out entries that don't exist within a user's project (visible work
trees). This works by keeping a vector of entry indices that exist
within a user's project and updates the list state based on these
entries when filtering the list.
I went with this approach so the stack frame list wouldn't have to
rebuild itself whenever the filter is toggled and it could persist its
state across toggles (uncollapsing a collapse list). It was also easier
to keep track of selected entries on toggle using the vector as well.
### Preview
https://github.com/user-attachments/assets/d86c7485-c885-4bbb-bebb-2f6385674925
Release Notes:
- debugger: Add option to only show stack frames from user's project in
stack frame list
73b38c8306