fix: support youtu.be short URLs and youtube.com/shorts#1734

Jah-yee wants to merge 2 commits intomicrosoft:mainmicrosoft/markitdown:mainfrom

Jah-yee:fix/youtu-be-short-urlsJah-yee/RoomWithOutRoof-markitdown:fix/youtu-be-short-urlsCopy head branch name to clipboard