fix(react): remove incorrect class key from IonicReactProps (#27432)

Issue number: N/A

---------

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## What is the current behavior?
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As noted in #27415,
`IonicReactProps` still has `class` as an exposed attribute on Ionic
React components. React components should use the `className` property
instead. It looks like this was left over code from the Ionic React beta
that never got removed.

`class` was originally added in
c79e74b#diff-065219c56a8c5dfc32564fac317b8cc9c03f1fbcb7f9cc2de0c5581970f21b51

And `className` was added in
ab0f92e#diff-065219c56a8c5dfc32564fac317b8cc9c03f1fbcb7f9cc2de0c5581970f21b51

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

- Removes the `class` key

## 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. -->

Author: liamdebeasi

packages/react/src/components/IonicReactProps.ts

@@ -1,5 +1,4 @@
 export interface IonicReactProps {
-  class?: string;
   className?: string;
   style?: { [key: string]: any };
 }