IGNITE-28432 Add storage name to segstore

[sashapolo]

https://issues.apache.org/jira/browse/IGNITE-28432

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[Copilot]

Pull request overview

Adds a distinct “storage name” dimension to segstore’s on-disk layout and background thread naming so multiple segstore instances can coexist more cleanly and be easier to identify operationally.

Changes:

• Extend SegmentFileManager to take storageName and place segments/indexes under baseDir/<storageName>/....
• Include storageName in segstore GC/checkpointer thread names and in SegmentFileManager startup logging.
• Update segstore-related tests to pass the new constructor parameter(s).

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/segstore/SegmentFileManager.java	Introduces storageName, changes directory layout to be storage-scoped, and updates logging/initialization accordingly.
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/segstore/RaftLogGarbageCollector.java	Adds storageName to the GC thread name for per-storage identification.
modules/raft/src/main/java/org/apache/ignite/internal/raft/storage/segstore/RaftLogCheckpointer.java	Adds storageName to the checkpoint thread name for per-storage identification.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/SegstoreLogStorageTest.java	Updates SegmentFileManager construction to pass storageName.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/SegstoreLogStorageConcurrencyTest.java	Updates SegmentFileManager construction to pass storageName.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/SegmentFileManagerTest.java	Updates helper to construct SegmentFileManager with storageName.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/SegmentFileManagerGetEntryTest.java	Updates SegmentFileManager construction to pass storageName.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/RaftLogGcSoftLimitTest.java	Updates SegmentFileManager construction to pass storageName.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/RaftLogGarbageCollectorTest.java	Updates SegmentFileManager construction to pass storageName.
modules/raft/src/test/java/org/apache/ignite/internal/raft/storage/segstore/RaftLogCheckpointerTest.java	Updates RaftLogCheckpointer construction to pass storageName.

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