CI: Optimize and collect op_tests summaries

[gyohuangxin]

Related to https://github.com/orgs/ROCm/projects/48/views/1?filterQuery=sprint%3A%40current+assignee%3A%22gyohuangxin%22&pane=issue&itemId=120791567&issue=ROCm%7Cframeworks-internal%7C12994

• Optimize the performance summary outputs in test logs.
• Collect and show the performance summary in an easy-to-read format.

[Copilot]

Pull request overview

This PR optimizes performance summary outputs in test logs and introduces automated collection of these summaries in an easy-to-read markdown format for CI workflows.

Key changes:

• Converts pandas DataFrame summary outputs to markdown format using to_markdown() across all operator test files
• Adds a new Python script (collect_logs.py) to extract and aggregate markdown summary blocks from test logs
• Integrates the log collection script into the GitHub Actions workflow to display summaries in the workflow step summary
• Adds the tabulate package dependency (required by pandas to_markdown() method)

Reviewed changes

Copilot reviewed 28 out of 28 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
op_tests/test_topk_plain.py	Refactored imports and converted summary output to markdown format
op_tests/test_topk_per_row.py	Converted two summary outputs (prefill and decode) to markdown format
op_tests/test_smoothquant.py	Converted three summary outputs to markdown format
op_tests/test_sample.py	Converted summary output to markdown format
op_tests/test_quant.py	Converted summary output to markdown format
op_tests/test_pa_ps.py	Converted summary output to markdown format
op_tests/test_pa_mtp.py	Converted summary output to markdown format
op_tests/test_pa.py	Converted summary output to markdown format
op_tests/test_moe_sorting_mxfp4.py	Converted two stage summary outputs to markdown format
op_tests/test_moe_sorting.py	Converted summary output to markdown format
op_tests/test_moe_dp_share_expert.py	Converted summary output to markdown format
op_tests/test_moe_2stage.py	Converted summary output to markdown format
op_tests/test_moeTopkSoftmax.py	Converted three summary outputs to markdown format
op_tests/test_mla_sparse.py	Converted summary output to markdown format
op_tests/test_mla_persistent.py	Converted summary output to markdown format
op_tests/test_mla.py	Converted summary output to markdown format
op_tests/test_kvcache.py	Converted summary output to markdown format
op_tests/test_indexer_k_quant_and_cache.py	Converted summary output to markdown format
op_tests/test_gemm_a8w8_blockscale.py	Converted summary output to markdown format
op_tests/test_gemm_a8w8.py	Converted summary output to markdown format
op_tests/test_gemm_a4w4.py	Converted summary output to markdown format
op_tests/test_gemm_a16w16.py	Converted summary output to markdown format
op_tests/test_deepgemm.py	Converted summary output to markdown format
op_tests/test_concat_cache_mla.py	Converted two summary outputs to markdown format
op_tests/test_activation.py	Converted two summary outputs to markdown format
.github/workflows/aiter-test.yaml	Added log collection step to extract and display markdown summaries in workflow output
.github/scripts/collect_logs.py	New script that parses log files to extract markdown-formatted summary tables
.github/scripts/build_aiter_triton.sh	Added tabulate package installation (required for pandas markdown conversion)

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