<fix>[guesttools]: support emoji script output

[MatheMatrix]

ZSTAC-86425

Summary

Backport the ZSTAC-80478 zstack schema fix to 5.4.10.

Root Cause

Guest script stdout/stderr can contain four-byte UTF-8 characters such as emoji. The existing GuestVmScriptExecutedRecordDetailVO columns cannot store those characters correctly with the old charset.

Fix

Add 5.4.10 schema DDL to modify stdout and stderr to utf8mb4 with utf8mb4_unicode_ci collation.

Upgrade Idempotence

The SQL uses ALTER TABLE MODIFY to set the same final column definitions. Re-running the DDL keeps the columns at the same definition, so the upgrade is idempotent.

Verification

• SQL was placed in conf/db/upgrade/V5.4.10__schema.sql, not V5.5.6__schema.sql.
• git diff --check upstream/5.4.10..HEAD passed.
• Full regression was not run locally.

Related: ZSTAC-86425, ZSTAC-80478

sync from gitlab !10395

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Reviewing files that changed from the base of the PR and between 08177ca and f1612f5.

📒 Files selected for processing (1)

• conf/db/upgrade/V5.4.10__schema.sql

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/yaohua.wu/bugfix/ZSTAC-86425@@2

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