[Cherry-Pick][CI] Add 4-GPU test job and fix stable_test(#6082)(#6270)

[EmmonsCurse]

Motivation

Existing CI coverage lacks validation for 4-card (4-GPU) deployment scenarios. This PR adds dedicated test cases to verify multi-card inference stability and basic functionality, ensuring issues related to distributed setup, resource allocation, and startup behavior can be detected earlier in CI.

In CI environments, using --ipc=host and --pid=host exposes the container to host-level IPC and process namespaces, which may introduce unintended interference between concurrent jobs running on the same machine.
Removing these options helps reduce cross-job coupling and improves isolation and stability of CI executions.

Modifications

• Added new end-to-end test cases for 4-card (4-GPU) deployment scenarios
• Integrated the new tests into the CI workflow
• Add GLM E2E tests for non-MTP and MTP
• Remove --ipc=host and --pid=host from _stable_test.yml

Usage or Command

N/A

Accuracy Tests

N/A

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!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/2.4@1079f92). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             release/2.4    #6279   +/-   ##
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  Coverage               ?   56.98%           
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  Files                  ?      330           
  Lines                  ?    41307           
  Branches               ?     6289           
==============================================
  Hits                   ?    23538           
  Misses                 ?    15932           
  Partials               ?     1837           

Flag	Coverage Δ
GPU	56.98% <ø> (?)

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