test(es/parser): test duplcate label

[bvanjoi]

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[changeset-bot]

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Latest commit: b14384e

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[codspeed-hq]

CodSpeed Performance Report

Merging #10784 will not alter performance

_{Comparing bvanjoi:parser-pref (b14384e) with dev/parser (60fa835)}

Summary

✅ 141 untouched benchmarks