[Model] Remove obsolete ERNIE models

[xianbaoqian]

Removes ErnieModel, ErnieForSequenceClassification, and ErnieForTokenClassification, the BERT-like Chinese ERNIE-3.0 pooling stack originally added in #36385. The implementation lived in a self-contained ernie.py with no external imports.

Per vllm-release telemetry over the last 6 months: ErnieModel recorded 31 instances / 0.56 GPU-hours, vs. the Ernie 4.5 family's combined ~76,000 GPU-hours over the same window (~0.001%).
ErnieForSequenceClassification and ErnieForTokenClassification had zero recorded usage.

The newer Ernie 4.5 family (Ernie4_5ForCausalLM, Ernie4_5_MoeForCausalLM, Ernie4_5_VLMoeForConditionalGeneration, ErnieMTPModel) uses separate implementation files and is unaffected.

Purpose

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

[mergify]

Documentation preview: https://vllm--45127.org.readthedocs.build/en/45127/

[DarkLight1337]

Please update _PREVIOUSLY_SUPPORTED_MODELS accordingly to direct users to use an older version of vLLM

[DarkLight1337]

cc @youkaichao

[mergify]

Hi @xianbaoqian, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

[DarkLight1337]

To avoid merge conflicts associated with updating _PREVIOUSLY_SUPPORTED_MODELS , let's merge these PRs one by one to avoid running CI unnecessarily. Can you set the other PRs to draft until this one is merged?

[youkaichao]

thanks for doing the cleanup!

[xianbaoqian]

Thanks for the prompt review @DarkLight1337 @hmellor @noooop . Updated

[noooop]

Please reverse the modifications related to ERNIE in tests/models/language/pooling/test_classification.py and tests/models/language/pooling/test_classification.py

PTAL #36385

[xianbaoqian]

Please reverse the modifications related to ERNIE in tests/models/language/pooling/test_classification.py and tests/models/language/pooling/test_classification.py

PTAL #36385

@noooop Nice catch! I'm not sure about the atol line. I removed it and let's see how presubmit react.

[github-actions]

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