Molt fetch fixes

[taroface]

DOC-12006
DOC-11690
DOC-11667

• Document --import-region flag.
• Fix type mapping JSON format.
• Mention MOLT Fetch as first option for loading data in migration tutorials. (This is a quick fix; the tutorial steps aren't updated to use Fetch yet. This will be tracked separately.)

[github-actions]

Files changed:

• src/current/molt/molt-fetch.md
• src/current/v23.2/migrate-from-mysql.md
• src/current/v23.2/migrate-from-postgres.md
• src/current/v24.1/migrate-from-mysql.md
• src/current/v24.1/migrate-from-postgres.md
• src/current/v24.2/migrate-from-mysql.md
• src/current/v24.2/migrate-from-postgres.md
• src/current/v24.3/migrate-from-mysql.md
• src/current/v24.3/migrate-from-postgres.md
• src/current/v25.1/migrate-from-mysql.md
• src/current/v25.1/migrate-from-postgres.md

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