[MM-52926] Deprecating work templates (#23466)

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/webpack.config.js

@@ -169,7 +169,6 @@ var config = {
         new CopyWebpackPlugin({
             patterns: [
                 {from: 'src/images/emoji', to: 'emoji'},
-                {from: 'src/images/worktemplates', to: 'worktemplates'},
                 {from: 'src/images/img_trans.gif', to: 'images'},
                 {from: 'src/images/logo-email.png', to: 'images'},
                 {from: 'src/images/circles.png', to: 'images'},