Improve get preview channel changes script

- Filter out N/As
- Identify missing release note lines

Co-Authored-By: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
e6bda025a3Joseph T. Lyons committed on 11/8/2023, 4:40:53 PMparent9e5a4ea
1 file changedLine totals unavailable