i18n(ja): restore English CLI flag names and argument types in command references

[yahonda]

What is changed, added or deleted? (Required)

CLI flag names and their argument-type hints are literal parts of the tool's --help output and must stay in English. The machine translation had katakana-ized them in the TiUP / TiDB Cloud CLI (ticloud) command-reference tables. This PR restores them to match the English source.

Two classes of defect fixed (76 rows across 18 files):

1. Flag names katakana-ized (name was corrupted): --gcs.サービスアカウントキー文字列 → --gcs.service-account-key string, --s3.アクセスキーID文字列 → --s3.access-key-id string, --csv.スキップヘッダー → --csv.skip-header, --csv.バックスラッシュエスケープ → --csv.backslash-escape, --csv.null値文字列 → --csv.null-value string, --マスターアドレス → --master-addr, and --文字列 → --where string (the --where name had been dropped entirely).

2. Argument-type hint translated (string → 文字列): normalized back to English so the type column is consistent with the int / int32 / strings hints that were already kept in English (e.g. --s3.secret-access-key 文字列 → --s3.secret-access-key string, --role 文字列 → --role strings).

All flag cells were verified 1:1 against the English release-8.5 source (including plural strings for --filter / --role / --add-role / --delete-role).

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 i18n-ja-release-8.5 machine-translation cleanup series

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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