Add URL handler support for Linux desktops

Fixes #48528

resources/linux/code-url-handler.desktop

@@ -0,0 +1,13 @@
+[Desktop Entry]
+Name=@@NAME_LONG@@ - URL Handler
+Comment=Code Editing. Redefined.
+GenericName=Text Editor
+Exec=/usr/share/@@NAME@@/@@NAME@@ --open-url %U
+Icon=@@ICON@@
+Type=Application
+NoDisplay=true
+StartupNotify=true
+StartupWMClass=@@NAME_SHORT@@
+Categories=Utility;TextEditor;Development;IDE;
+MimeType=x-scheme-handler/vscode
+Keywords=vscode;