TableToolbarSearch is firing onSearch twice for every input

[scottdickerson]

What package(s) are you using?

• carbon-components
• carbon-components-react

Detailed description

Describe in detail the issue you're having.

Is this issue related to a specific component?

What did you expect to happen? What happened instead? What would you like to
see changed?
To see the issue simply render a TableToolbarSearch and then type into it
<TableToolbarSearch
placeHolderText={i18n.searchPlaceHolderText}
onChange={onSearch}
className={${iotPrefix}--tile-catalog--tile-canvas--header--search}
/>

What browser are you working in?
Chrome and Jest

What version of the Carbon Design System are you using?
"carbon-components": "^10.26.0",
"carbon-components-react": "^7.26.0",

What offering/product do you work on? Any pressing ship or release dates we
should be aware of?

Steps to reproduce the issue

See this codesandbox to see the issue:
https://codesandbox.io/s/carbon-components-react-forked-5q8de?file=/src/index.js

If you type into search field and check the console.log you'll see two entries for each button press

[tw15egan]

This will be fixed via #7613