Revert "CI: Use build-only-aiter runner to build Triton wheels"

[gyohuangxin]

Reverts #2934

[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: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
ci:atom	ATOM benchmark (DeepSeek-R1 + GPT-OSS)
ci:vllm	vLLM benchmark
ci:all	All of the above

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[Copilot]

Pull request overview

Reverts a prior CI change so the Triton wheel build in the Triton test workflow runs on an MI35X GPU runner instead of the build-only-aiter runner, aligning the build job with its current GPU device expectations.

Changes:

• Update build-triton job runner from build-only-aiter to linux-aiter-mi35x-1.

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