<fix>[storage]: ZSTAC-86494 backport actual ZBS image format

[zstack-robot-2]

Summary

Backport the merged ZSTAC-78094 fix so ExternalPrimaryStorage records the actual image format returned by zstore instead of the source volume format.

Changes

• Cherry-pick source zstack commit 1f4e47dfb2dadfa03c1d6c99089889a3e9b1d0a0
• Preserve original Change-Id I716d747961666979766372626d7679716262667a

Testing

• Exact source production patch
• git diff --check
• Remote x86 package and targeted ZBS case (run against MR refs)

Resolves: ZSTAC-86494

sync from gitlab !10493

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• storage/src/main/java/org/zstack/storage/addon/primary/ExternalPrimaryStorage.java

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