[CI] Relocate server test cases from ci_use directory to e2e

[EmmonsCurse]

Motivation

This PR relocates several server-related test cases from the ci_use directory to the e2e test suite.
The purpose is to better categorize these tests as end-to-end cases, ensuring clearer separation between lightweight CI tests and full e2e validations.

Modifications

• Moved server test cases from tests/ci_use to tests/e2e/
  • EB_VL_Lite/test_rollout_model.py
  • EB_VL_Lite/baseline.txt
  • ERNIE_0dot3B/test_ernie_03b_pd.py
  • EB_Lite/test_ernie_21b_mtp.py
• Added utility module: tests/e2e/utils/rollout_model.py
• Updated directory structure to align with e2e test organization

Usage or Command

No command changes.

Accuracy Tests

No impact on model accuracy or runtime logic.

Checklist

• Add at least a tag in the PR title.
  • Tag list: [[FDConfig],[APIServer],[Engine], [Scheduler], [PD Disaggregation], [Executor], [Graph Optimization], [Speculative Decoding], [RL], [Models], [Quantization], [Loader], [OP], [KVCache], [DataProcessor], [BugFix], [Docs], [CI], [Optimization], [Feature], [Benchmark], [Others], [XPU], [HPU], [GCU], [DCU], [Iluvatar], [Metax]]
  • You can add new tags based on the PR content, but the semantics must be clear.
• Format your code, run pre-commit before commit.
• Add unit tests. Please write the reason in this PR if no unit tests.
• Provide accuracy results.
• If the current PR is submitting to the release branch, make sure the PR has been submitted to the develop branch, then cherry-pick it to the release branch with the [Cherry-Pick] PR tag.

[paddle-bot]

Thanks for your contribution!

[YuanRisheng]

这个文件为啥不能移过来

[EmmonsCurse]

有其他的测试用例也依赖这个，留作后续 py312 的验证使用了