br: pre-lease log-backup storage and readLock leak fixes#67850

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RidRisR wants to merge 3 commits intopingcap:masterfrom

RidRisR:bugfix/merge-migrations-preserves-ingested-sst-paths

Commits on Apr 17, 2026

br/pkg/stream: preserve m2's IngestedSstPaths in MergeMigrations
RidRisR
committed
br/pkg/stream: add regression test asserting BASE paths stay bounded
RidRisR
committed
br/pkg/restore/log_client: release readLock when migration Load fails
RidRisR
committed