[Cherry-Pick][CI] Sync parallelism optimization from dev to 2.5 (#7085)

[EmmonsCurse]

Cherry-pick of #7085 #7132 #7138 (authored by @EmmonsCurse) to release/2.5.

devPR:#7085 #7132 #7138

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Motivation

• Current unittest execution runs mostly in a sequential manner, leading to low GPU utilization and long CI turnaround time. In addition, when tests fail, logs are scattered and not easy to locate, which increases debugging cost.
• Removing --ipc=host exposed shared memory related issues (e.g., IPC/SHM allocation failures) and default Docker /dev/shm (64MB) is insufficient for multi-process / multi-GPU tests

Modifications

• Introduce single-GPU parallel execution by splitting independent tests into multiple shards
• Classify tests into multi-GPU and single-GPU to ensure correct scheduling
• Execute multi-GPU tests sequentially to avoid resource conflicts
• Remove residual console_error.log* files and ensure only failed test cases keep their log directories
• Package and upload logs for easier debugging and traceability
• Remove --ipc=host to avoid cross-task interference
• Add --shm-size=64g to ensure sufficient shared memory for model serving
• Add --sysctl kernel.msgmax and kernel.msgmnb to support larger IPC message queues
• Keep container-level isolation while ensuring stability for multi-GPU workloads

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.

[EmmonsCurse]

/skip-ci ci_iluvatar
/skip-ci ci_hpu
/skip-ci build_xpu
/skip-ci gpu_4cards_test
/skip-ci pre_ce_test
/skip-ci stable_test

[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/2.5@14676a3). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             release/2.5    #7140   +/-   ##
==============================================
  Coverage               ?   69.03%           
==============================================
  Files                  ?      390           
  Lines                  ?    54234           
  Branches               ?     8555           
==============================================
  Hits                   ?    37442           
  Misses                 ?    14079           
  Partials               ?     2713           

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