fix: Resolve dupBranchBody in VSCode extension installation

- Extract common command execution logic to eliminate duplicate branches
- Both Windows and non-Windows branches now only differ in executable name
- Fixes gocritic dupBranchBody warning in downloadAndInstallExtension function

Author: agrasth

general/ide/vscode/vscode.go

@@ -543,13 +543,14 @@ func (vic *VscodeInstallCommand) downloadAndInstallExtension(repoURL string) err
 	log.Info("Installing extension using VSCode CLI...")
 
 	// Install extension using VSCode's CLI
-	var cmd *exec.Cmd
+	var codeCmd string
 	if runtime.GOOS == "windows" {
-		cmd = exec.Command("code.cmd", "--install-extension", tempFile, "--force")
+		codeCmd = "code.cmd"
 	} else {
-		cmd = exec.Command("code", "--install-extension", tempFile, "--force")
+		codeCmd = "code"
 	}
 
+	cmd := exec.Command(codeCmd, "--install-extension", tempFile, "--force")
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		return fmt.Errorf("failed to install extension via VSCode CLI: %w\nOutput: %s", err, string(output))