goodman-oai 12b2b58e63
Release the rollout maintenance lock when its guard is dropped ( #57247 ) ...
## Why
A duplicated or inherited file handle can keep the rollout maintenance lock held after its guard is dropped, blocking subsequent compression or migration.
## What changed
Explicitly unlock the file in `RolloutMaintenanceGuard::drop` so lock ownership ends with the guard even if another handle remains open.
## Testing
Add a regression test that retains a duplicated file handle, verifies that the lock stays held until the last shared guard is dropped, and checks that dropping the old handle does not release a newly acquired lock.
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goodman-oai
12b2b58e63