* The code for passing the trace context to a sub process has been
improved to increase code reuse. This code is used when the action
templates are rendered in a sub process.
* A macro has also been added for the error term that is thrown when the
action shall be stopped after the templates has been rendered. This is
also done to reduce code duplication and to reduce the risk of
introducing bugs due to typos.
* Fix incorrect type spec
Thanks to @zmstone for suggesting these improvements in comments to a PR
(https://github.com/emqx/emqx/pull/12916).
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