Add missing performance input on win32

Fixup for eclipse-platform#2763

Part of eclipse-platform#2714

Author: jonahgraham

.github/workflows/maven.yml

@@ -58,6 +58,7 @@ jobs:
       runner: windows-latest
       java: ${{ matrix.java }}
       native: win32.win32.x86_64
+      performance: ${{ contains(github.event.pull_request.labels.*.name, 'performance') }}
 
   build-macos:
     name: Build (macOS)