[Bugfix] Fix the bug that qwen3 moe doesn't work with aclgraph

[shen-shanshan]

What this PR does / why we need it?

What's the PR does:

1. Move AscendSparseMoeBlock to qwen3 model, since it's only used by qwen3 model.
2. Disable AscendSparseMoeBlock if aclgraph is enabled, AscendSparseMoeBlock doesn't work with aclgraph currently.

Does this PR introduce any user-facing change?

How was this patch tested?

[gemini-code-assist]

Code Review

This pull request aims to fix an issue where qwen3 MoE models do not work with aclgraph. The changes involve moving the Ascend-specific MoE block implementation to the qwen3 model file and conditionally disabling it when aclgraph is enabled. While the overall approach is sound, the current implementation introduces critical bugs. Specifically, the method signatures for the newly introduced CustomSparseMoeBlock and the conditionally used Qwen3MoeSparseMoeBlock are incompatible with how they are called, which will lead to runtime TypeErrors. I have provided detailed comments and suggestions to address these critical issues.

[wangxiyuan]

vllm runner actually runs in eager mode by default.