[0.76] Cherry pick a bunch of fabric fixes, and update WASDK to release version#14606

acoates-ms merged 29 commits into

microsoft:0.76-stablemicrosoft/react-native-windows:0.76-stablefrom

acoates-ms:cherrypickwasdk76acoates-ms/react-native-windows:cherrypickwasdk76Copy head branch name to clipboard