<fix>[db]: ZSTAC-85010 add CBT temp volume schema

[ZStack-Robot]

Summary

Add the database schema for CbtTaskTemporaryVolumeVO in the 5.4.12 upgrade SQL. This table is used by the companion premium CBT fix to keep scratch volumes out of CbtTaskResourceRefVO.

Changes

• Add CbtTaskTemporaryVolumeVO to conf/db/upgrade/V5.4.12__schema.sql.
• Define (taskUuid, sourceVolumeUuid) unique constraint to match the premium VO.
• Add cascade foreign keys to CbtTaskVO and VolumeEO.

Testing

• git diff --check upstream/5.4.12..HEAD

Companion premium MR will use the same source branch name: fix/ZSTAC-85010-5.4.12@@2.

Supersedes premium-only MR: http://dev.zstack.io:9080/zstackio/premium/-/merge_requests/14737

Resolves: ZSTAC-85010

sync from gitlab !10532

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• conf/db/upgrade/V5.4.12__schema.sql

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