fix: make Disable Windows Defender step optional in E2E workflow

Agent-Logs-Url: https://github.com/voidzero-dev/vite-plus/sessions/d8e90bc7-7681-48a8-a308-f15ec0de0caf

Co-authored-by: fengmk2 <156269+fengmk2@users.noreply.github.com>

Author: Copilot

.github/workflows/e2e-test.yml

@@ -83,6 +83,7 @@ jobs:
       # Disable Windows Defender real-time scanning to speed up I/O-heavy builds (~30-50% faster)
       - name: Disable Windows Defender
         if: runner.os == 'Windows'
+        continue-on-error: true
         shell: powershell
         run: Set-MpPreference -DisableRealtimeMonitoring $true
 
@@ -344,6 +345,7 @@ jobs:
       # Disable Windows Defender real-time scanning to speed up I/O-heavy operations
       - name: Disable Windows Defender
         if: runner.os == 'Windows'
+        continue-on-error: true
         shell: powershell
         run: Set-MpPreference -DisableRealtimeMonitoring $true