fix: show reset button for uncontrolled searchbox

[Ninfa-Jeon]

Done

• I have added a local state to the SearchBox component to track input for internally-controlled cases
• This allows the "reset"/"close" button to be rendered for this case as well

QA

Pinging @canonical/react-library-maintainers for a review.

Storybook

To see rendered examples of all react-components, run:

yarn start

QA in your project

from react-components run:

yarn build
npm pack

Install the resulting tarball in your project with:

yarn add <path-to-tarball>

QA steps

• Open the storybook and see that the close button is appearing for internally-controlled cases as well

Percy steps

• No visual changes expected

[huwshimi]

Thanks!

[github-actions]

🎉 This PR is included in version 4.4.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀