[CI] ci: re-enable moe 2stage test

[gyohuangxin]

Summary

• Re-enable op_tests/test_moe_2stage.py in Aiter Test
• The OOM issue has been addressed on main by fix moe ut oom #4844

Testing

• bash -n .github/scripts/aiter_test.sh
• git diff --check

[github-actions]

🏷️ CI Guide

Runs automatically on every PR:

• ✅ Pre-checks (submodule verification, code formatting)
• ✅ Aiter op tests (gfx942 + gfx950)
• ✅ Triton tests on MI35X (only when aiter/ops/triton/** or related paths are changed)

Extended tests (opt-in via labels):

Label	Tests
ci:gfx1250-ffm-triton	Run the five-shard gfx1250 FFM Triton test suite
ci:triton-300x	Run an additional Triton test job on MI300X in PRs; main branch always runs both MI35X and MI300X
ci:sglang	SGLang integration tests: DeepSeek-R1-MXFP4 accuracy, Qwen 3.5 accuracy
ci:atom	ATOM benchmark: DeepSeek-R1-0528, GPT-OSS-120B
ci:atom_full	ATOM accuracy suite for PR and main models from ATOM models_accuracy.json
ci:vllm	vLLM benchmark: GPT-OSS-120B, DeepSeek-R1-0528, Kimi-K2.5
ci:all	All standard extended tests (excludes ci:atom_full)

Only add ci:atom_full for FlyDSL or Triton upgrades.
Add labels via the sidebar or gh pr edit 4854 --add-label <label>

PR title tags:
Component tags ([Triton/Gluon], [HIP], [CK], [ASM], ...) are added to the PR title automatically from the changed files and re-synced on every push — change-type tags like [fix]/[Perf] and op tags like [MLA] are left untouched. Add the no-auto-title label to opt this PR out of title tagging.

[Copilot]

Pull request overview

This PR updates the CI test runner script to re-enable the op_tests/test_moe_2stage.py test in the Aiter Test workflow, now that the prior OOM condition is stated to be resolved on main (per referenced PR #4844).

Changes:

• Removed op_tests/test_moe_2stage.py from the skip_tests list in .github/scripts/aiter_test.sh, allowing it to run again as part of the standard op_tests shard execution.

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