i18n(ja): fix broken GCS permission literal in tidb-cloud-auditing.md

[yahonda]

What is changed, added or deleted? (Required)

Fix a broken code literal in the Japanese tidb-cloud/tidb-cloud-auditing.md. In the GCS access permission list, the permission name storage.objects.delete had been machine-translated to storage.オブジェクト.削除, which is not a valid permission string.

     -   storage.objects.create
-    -   storage.オブジェクト.削除
+    -   storage.objects.delete

The sibling permission storage.objects.create was already correct, and the English source lists exactly storage.objects.create / storage.objects.delete.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• This PR is translated from: N/A (Japanese-only fix; no English source change)
• Other reference link(s): part of the ja i18n-ja-release-8.5 machine-translation cleanup

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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