[TRTLLM-15040][test] Prune legacy Llama and Nemotron tests

[xinhe-nv]

Remove out-of-scope model-specific coverage while retaining generic KV-cache, LoRA, and architecture validation on supported Llama assets.

Summary

• Removed legacy Llama, Nemotron, DeciLM, and unsupported model-specific coverage.
• Retained generic KV-cache, LoRA, speculative decoding, and architecture validation.
• Updated model paths, registries, accuracy references, performance configurations, fixtures, and integration test lists.
• Replaced legacy Llama KV-cache coverage with Qwen3 and Qwen3 LoRA scenarios.
• Replaced legacy Llama LoRA coverage with Llama 3.1 FP8/BF16 coverage.
• Updated Spark coverage with Qwen3, Nemotron Nano, and GPT-OSS cases.

Dev Engineer Review

• Verify that removed model paths and registry entries are not referenced by retained tests or deployment workflows.
• Verify consistency across .pre-commit-config.yaml, legacy-files.txt, ruff-legacy.toml, and ruff-legacy-baseline.json.
• Verify Qwen3 KV-cache V2 coverage for correctness, chunked prefill, eviction, block reuse, overlap scheduling, partial reuse, and LoRA scenarios.
• Verify that Llama 3.1 model paths, adapter paths, adapter names, ranks, and cache settings match available test assets.
• Verify configuration values, test paths, and test-list entries.
• Check for regression gaps caused by removed model-specific coverage.
• CI run #67048 and L0_MergeRequest_PR pipeline #54589 failed. No fix or rerun result was provided.

QA Engineer Review

• Added or updated Llama 3.1 LoRA, speculative decoding, API, memory profiling, metrics, and Qwen3 KV-cache tests.
• Removed Nemotron NAS, DeciLM, legacy Llama, and obsolete model-specific tests.
• Updated QA lists: llm_function_core.txt, llm_spark_core.txt, llm_spark_func.yml, and llm_spark_perf.yml.
• Updated test-db lists: l0_a10.yml, l0_a30.yml, l0_b200.yml, l0_dgx_b200.yml, l0_dgx_h100.yml, l0_dgx_h200.yml, and l0_gb200_multi_gpus.yml.
• Removed obsolete entries from tests/integration/test_lists/waives.txt.
• Several modified and added test functions do not have explicit test-list coverage mapping in the supplied changes.
• Verdict: needs follow-up.

Description

Test Coverage

PR Checklist

Please review the following before submitting your PR:

• PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.

• PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.

• Test cases are provided for new code paths (see test instructions)

• If PR introduces API changes, an appropriate PR label is added - either api-compatible or api-breaking. For api-breaking, include BREAKING in the PR title.

• Any new dependencies have been scanned for license and vulnerabilities

• CODEOWNERS updated if ownership changes

• Documentation updated as needed

• Update tava architecture diagram if there is a significant design change in PR.

• The reviewers assigned automatically/manually are appropriate for the PR.

• Please check this after reviewing the above items as appropriate for this PR.

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PR_Github #70325 [ run ] triggered by Bot. Commit: 925be22 Link to invocation

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PR_Github #70325 [ run ] completed with state FAILURE. Commit: 925be22
/LLM/main/L0_MergeRequest_PR pipeline #57564 completed with status: 'FAILURE'

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PR_Github #70507 [ run ] triggered by Bot. Commit: 925be22 Link to invocation

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PR_Github #70507 [ run ] completed with state FAILURE. Commit: 925be22
/LLM/main/L0_MergeRequest_PR pipeline #57727 completed with status: 'FAILURE'

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PR_Github #70580 [ run ] triggered by Bot. Commit: 925be22 Link to invocation

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PR_Github #70580 [ run ] completed with state SUCCESS. Commit: 925be22
/LLM/main/L0_MergeRequest_PR pipeline #57788 completed with status: 'FAILURE'

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PR_Github #70615 [ run ] triggered by Bot. Commit: 925be22 Link to invocation

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PR_Github #70615 [ run ] completed with state SUCCESS. Commit: 925be22
/LLM/main/L0_MergeRequest_PR pipeline #57819 completed with status: 'UNSTABLE'

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