[lldb] Refactor LLDB Breakpoint Event Notifications to centralize and eliminate code duplication (#164739)
### Summary
This PR refactors breakpoint event notification in LLDB to centralize
and eliminate code duplication. It creates a unified method in the
`Target` class for sending breakpoint change events. The new methods
check if listeners exist before broadcasting events
### Test
<img width="1532" height="76" alt="Screenshot 2025-10-23 at 12 49 31 PM"
src="https://github.com/user-attachments/assets/6d6a6da6-9684-463c-aeeb-90663cdbd077"
/>
---------
Co-authored-by: Piyush Jaiswal <piyushjais@meta.com>