ci: simplify codspeed sharding

[0ax1]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.51%. Comparing base (a3a3ed7) to head (ed4adbd).
⚠️ Report is 2 commits behind head on develop.

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[codspeed-hq]

CodSpeed Performance Report

Merging #5572 will degrade performances by 12.04%

_{Comparing ad/simplify-shard-setup-2 (ed4adbd) with develop (fec90ce)}

Summary

❌ 1 regression
✅ 1513 untouched
⏩ 256 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	encode_specialized	2.3 ms	2.7 ms	-12.04%

Footnotes

1. 256 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩