Benchmark dashboard should use the commit as the x axis

[timotheeguerin]

X axis is the date the benchmark was taken which is not really relevant.

[github-actions]

🎯 Issue Triage

The benchmark dashboard currently uses the date as the x-axis, which is not meaningful — it should use the commit SHA instead for better traceability.

Category: Feature Request
Area: eng

🔍 Analysis

Using commit SHA as the x-axis on the benchmark dashboard would make it easier to correlate performance changes with specific code changes. Dates can be misleading since multiple commits may land on the same day or benchmarks may not run for every commit at the same cadence.

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