[Fix] skip xlite e2e test

[lulina]

What this PR does / why we need it?

Due to the differences in operators used and execution order between xlite and eager modes, there will be slight precision discrepancies. This patch skip the xlite e2e tests.

Does this PR introduce any user-facing change?

No

How was this patch tested?

vLLM version: v0.12.0
vLLM main: vllm-project/vllm@ad32e3e

• vLLM version: v0.12.0
• vLLM main: vllm-project/vllm@ad32e3e

[gemini-code-assist]

Code Review

This pull request disables two end-to-end tests for xlite mode by adding @pytest.mark.skip. The reason provided is to handle precision discrepancies between xlite and eager modes. While this addresses CI failures, a better approach is to mark these tests as expected failures. I have recommended replacing @pytest.mark.skip with @pytest.mark.xfail(reason=...). This approach keeps the tests within the test suite, making the known issue visible, and will alert the team if the tests unexpectedly start passing, which could indicate the underlying issue has been resolved.

[gemini-code-assist]

Instead of unconditionally skipping this test with @pytest.mark.skip, it is better practice to mark it as an expected failure using @pytest.mark.xfail. This will still prevent the test from failing the CI, but it keeps the test active in the test suite. If the underlying precision issue is ever resolved and the test starts passing, xfail will flag it as an unexpected pass, providing visibility that the issue may be fixed.

Suggested change

	@pytest.mark.skip
	@pytest.mark.xfail(reason="Known precision discrepancies between xlite and eager modes")

[gemini-code-assist]

Similar to the other test, please use @pytest.mark.xfail instead of @pytest.mark.skip. This clearly documents that there is a known failure and ensures the test is still executed. It improves tracking of the issue and will notify you if the test's behavior changes from failing to passing in the future.

Suggested change

	@pytest.mark.skip
	@pytest.mark.xfail(reason="Known precision discrepancies between xlite and eager modes")

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