fix: cannot access columns exported by FOREACH in DO clause

[terry-xiaoyu]

Fixes EEC-852

Summary

🤖 Generated by Copilot at 154fe44

This pull request prepares the release of emqx 4.4.19 by updating the version numbers of the emqx, emqx_rule_engine, and emqx_dashboard applications, and the appup files for the emqx and emqx_rule_engine applications. It also fixes a bug in the rule engine runtime and adds and updates test cases for the rule engine SQL parser and validator.

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