RobinTail / express-zod-api / 28279418815

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fix(mem): Prevent multiple deprecation listeners (#3490)

This should not affect the regular runtime, since `createServer` is
supposed to be called once.
However, in tests, it could be called multiple times and this should
prevent attaching too many listeners to the process, which may cause a
warning in message by Node.js

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Graceful shutdown can now include additional HTTP/HTTPS servers added
after the shutdown monitor is created.
* **Bug Fixes**
* Prevented duplicate deprecation and termination event handlers from
being registered when initialization is called multiple times.
* Improved graceful shutdown orchestration so all queued cleanup hooks
are executed (and allowed to settle) before the process exits.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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