Dmitriy Kovalenko 036e160181
Allow concurrent readers of the installation ID ( #59021 ) ...
## Why
Resolving an existing installation ID takes an exclusive file lock, unnecessarily serializing readers.
## What changed
Read `installation_id` under a shared lock. If its contents are missing or invalid, acquire an exclusive lock and reread the file before generating a UUID, so an ID initialized by another process is reused.
## Testing
Extend the existing UUID reuse test to verify that resolution completes while another shared lock is held on Unix and still restores file permissions to `0o644`.
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Dmitriy Kovalenko
036e160181