[xpu][test] Skip WIP cases in test/quantization/test_qat.py for intel XPU

[zxd1997066]

For #2917, This PR is targeted to skip test_qat_4w_quantizer and test_quantize_api_intx which is WIP on intel XPU, and they failed in xpu test https://github.com/pytorch/ao/actions/runs/19953611835/job/57218382266#step:18:53831

[pytorch-bot]

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As of commit 339a3bf with merge base 70e903b ():
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[zxd1997066]

cc @liangan1

[pytorch-bot]

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[pytorch-bot]

To add the ciflow label ciflow/xpu please first approve the workflows that are awaiting approval (scroll to the bottom of this page).

This helps ensure we don't trigger CI on this PR until it is actually authorized to do so. Please ping one of the reviewers if you do not have access to approve and run workflows.

[pytorch-bot]

To add the ciflow label ciflow/xpu please first approve the workflows that are awaiting approval (scroll to the bottom of this page).

This helps ensure we don't trigger CI on this PR until it is actually authorized to do so. Please ping one of the reviewers if you do not have access to approve and run workflows.