[vLLM][moe] Keep batched moe reference activation eager, guard CUDA stream-capture checks, and update skiplist

[sarah12121212]

This updates the vLLM patch for batched MoE XPU coverage.

The patch:

• builds the MoE torch reference activation with compile_native=False
• reuses that eager activation in the expert loop
• guards torch.cuda.is_current_stream_capturing() behind current_platform.is_cuda()
• moves tests/kernels/moe/test_batched_moe.py::test_fused_moe_batched_experts in the default and Xe2 MoE skiplists to the WorkspaceManager not initialized error section.

CI Validation:

PVC:
BMG: