fix(mongodb): hide batch_size for mongodb resource

[zmstone]

MongoDB connector currently does not support batching so the batch_size option has no effect.
However we cannot remove the field, so we choose to hide it from schema

Fixes EMQX-10220

Summary

🤖 Generated by Copilot at bbf2993

Added resource_opts field to MongoDB bridge schema and modified create_opts function in emqx_resource_schema module. These changes make the MongoDB bridge consistent with other resource schemas and disable batching for MongoDB. Updated internationalization file for the batch_size field.

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

The base branch was changed.

[yanzhiemq]

Bug Fixes

• Do not allow batch_size option for MongoDB bridge resource. MongoDB connector currently does not support batching, the bath_size config value is forced to be 1 if provided.

[yanzhiemq]

修复

• 不允许为 MongoDB 桥接资源设置 batch_size 选项。当前的 MongoDB 连接器不支持批量处理，如果提供了 batch_size 配置值，它将被强制设置为1。