Issue number: Resolves#28186
---------
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issue. -->
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etc). Submit multiple pull requests if needed. -->
## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->
Ionic lifecycle hooks do not execute a cleanup function when the
underlying `useEffect` is unmounted.
```ts
useEffect(() => {
return () => {
console.log('cleanup'); // called
};
});
useIonViewWillEnter(() => {
return () => {
console.log('cleanup'); // never called
};
});
```
Ionic's implementation registers the lifecycle callback to be handled at
a later time, by the page managers. However, it does not keep a
reference to the returned callback, so it cannot execute it when the
`useEffect` is unmounted.
## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->
- Ionic lifecycle hooks execute dev-specified cleanup functions
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->
## Other information
<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->
Dev-build: `7.4.4-dev.11696956070.1faa3cfe`
This PR builds on the changes in #28316.
---------
Co-authored-by: Maria Hutt <maria@ionic.io>
Co-authored-by: Amanda Johnston <90629384+amandaejohnston@users.noreply.github.com>
