[0.81] Create prepare-release script and bot pipeline - #15744

[0.81] Create prepare-release script and bot pipeline#15744

Vladimir Morozov (vmoroz) merged 2 commits into

microsoft:0.81-stablemicrosoft/react-native-windows:0.81-stablefrom

vmoroz:PR/0.81-prepare-release-scriptvmoroz/microsoft-react-native-windows:PR/0.81-prepare-release-scriptCopy head branch name to clipboard