Persist partition map history to system keys for recovery

[akankshamahajan15]

This PR adds the persistence and read path for partition map history on storage servers, so catch-up workers during recovery can route old-epoch mutations correctly.

1. New system key: \xff\x02/backupPartitionmap/[8-byte epoch][8-byte version] := serialized PartitionMap
2. Implemented persistPartitionMapToSS: idempotent write called by current-epoch workers when they receive a new partition map. PartitionMap is persisted to both S3 and SS.
3. Implemented loadPartitionMapHistoryFromSS: used by old epoch backup workers; reads all entries for an epoch in version order after recovery to get partitionMap.

TODO: In next PR:

• Logic of switching to multiple partitionmap for same epoch for old epoch backupworkers will be handled in next PR.
  • Example: backup starts at v=1 with PM_A; a re-partition fires at v=90 producing PM_B (still in epoch 1); recovery hits at v=100. A catch-up worker for epoch 1 draining v=80..100 must use PM_A for [80, 90) and PM_B for [90, 100). That
    requires reading multiple history entries and switching maps at the version boundary.
• PartitionMap could be received anytime. Handle that in the code.

Dependencies

This PR depends on #13245.
This PR includes all changes from #13245 plus additions on top.

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[Copilot]

Pull request overview

Adds a persistence + recovery read path for backup range-partitioned partition maps by storing per-(epoch, version) PartitionMap entries in system keys, enabling old-epoch catch-up backup workers to route mutations correctly after recovery.

Changes:

• Introduces \xff\x02/backupPartitionmap/[epoch][version] system-key encoding helpers and range helpers.
• Implements a write path (persistPartitionMapToSS) for current-epoch workers and a read path (loadPartitionMapHistoryFromSS) for catch-up workers.
• Refactors range-partitioned backup worker lifecycle to monitor log system updates in a dedicated actor and to support graceful shutdown on worker_removed.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
fdbserver/core/include/fdbserver/core/BackupPartitionMap.h	Adds PartitionMapHistory type alias and modernizes typedefs.
fdbserver/backupworker/BackupWorkerRangePartitioned.cpp	Persists partition map history to SS; reads it for catch-up workers; refactors readiness/shutdown/logsystem monitoring.
fdbserver/backupworker/BackupWorker.cpp	Removes unused fields from VersionedMessage / BackupData.
fdbclient/SystemData.cpp	Implements key/range encode/decode helpers for partition map history system keys.
fdbclient/include/fdbclient/SystemData.h	Declares the new system-key range + helper APIs.
fdbclient/FileBackupAgent.cpp	Avoids watching allWorkerStarted for range-partitioned log backups (not set by those workers).

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