fix(tab-button): update event type interface on React (#27950)

closes #27949

---------

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

- Typescript is complaining about the `onClick` event type of the
`IonTabButton`

```ts
const App: React.FC = () => {
  async function handleTabClick(e: CustomEvent<HTMLIonTabButtonElement>) {
    alert(e.detail.tab);
  }

  return (
    <IonTabButton tab="myTab" onClick={handleTabClick}>
  );
};
```

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- `onClick` handler uses `CustomEvent` type
- Typescript does not error

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->




## Other information

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screenshots of how the component looks before and after the change. -->