Closes #52586

## Summary
- cap the restricted project list height inside the security modal and
make it scroll
- cap the modal body content height so the action buttons stay reachable
on smaller screens
- add a regression test that reproduces the overflow scenario with many
restricted projects in a constrained window

## Validation
- manually reproduced the overflow by opening 60 untrusted projects in a
720x620 window before the fix
- cargo test -p workspace
test_security_modal_project_list_scrolls_when_many_projects_are_restricted
- cargo check -p workspace

Release Notes:

- Fixed restricted mode dialogs overflowing past the window when many
unrecognized projects are open.

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Co-authored-by: Danilo Leal <daniloleal09@gmail.com>