### What this PR does / why we need it?
This PR fixes and simplifies the CI configuration for Qwen3 32B.
The main changes are:
- Remove the redundant `Qwen3-32B-Int8-A3-Feature-Stack3.yaml` config
and consolidate the CI setup into `Qwen3-32B-Int8.yaml`.
- Improve runtime stability by adding
`PYTORCH_NPU_ALLOC_CONF=expandable_segments:True` and setting
`--max-num-seqs 80`.
- Update the accuracy benchmark from `aime2024` to `gsm8k-lite`, and
adjust the related dataset config, output length, baseline, and
threshold accordingly.
These changes make the Qwen3 32B CI easier to maintain and more stable
in nightly validation.
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Signed-off-by: ZYang6263 <zy626375@gmail.com>
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