Deduplicate walltime perf symbols, unwind data and debug info across pids#240

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GuillaumeLagrange wants to merge 10 commits intomainfrom

cod-2138-deduplicate-perf-maps-and-unwind_data

Commits on Feb 12, 2026

feat: use bench_pids filters when harvesting symbols from perf file
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feat: deduplicate symbol maps, unwind_data and debug info
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chore: add a script to compare the actual content of runs across the refactor
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chore: make old unwinddata parser available
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feat: add unit test for breaking change detection in unwind_data
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feat: re-add old debug_info_by_pid field for old report backend parsing
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refactor: add helper functions for artifacts saving
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feat: skip tests requiring sudo if `GITHUB_ACTIONS` is not set
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feat: get rid of path hashing in favor of an index-based shared map
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--wip-- [skip ci]
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