feat(bundler/nsis): add /UPDATE flag (#9559)

* feat(bundler/nsis): add `/UPDATE` flag

* typo

* typo

* skip webview2 installation on updating

Author: amrbashir

.changes/bundler-shortcuts-updating.md

@@ -0,0 +1,6 @@
+---
+"tauri-bundler": "patch:enhance"
+---
+
+Added `/UPDATE` flag for NSIS installer which will make the installer avoid deleting app data and re-creating shortcuts.
+

tooling/bundler/src/bundle/windows/nsis.rs

@@ -451,6 +451,10 @@ fn build_nsis_app_installer(
     output_path.join("FileAssociation.nsh"),
     include_str!("./templates/FileAssociation.nsh"),
   )?;
+  write_ut16_le_with_bom(
+    output_path.join("utils.nsh"),
+    include_str!("./templates/utils.nsh"),
+  )?;
 
   let installer_nsi_path = output_path.join("installer.nsi");
   write_ut16_le_with_bom(