fix(react-file-type-icons): Map mhtml extension to html icon#28112

tomi-msft merged 4 commits intomicrosoft:mastermicrosoft/fluentui:masterfrom

alina-zaieva:add-mhtml-extension-to-filetypeiconmapalina-zaieva/fluentui:add-mhtml-extension-to-filetypeiconmapCopy head branch name to clipboard