Get rid of react warning : componentWillMount has been renamed, and is not recommended for use.

[hannes-o-brunner]

@salesforce/design-system-react@0.10.12

React 16.9 emits the following warning:

Warning: componentWillMount is deprecated and will be removed in the next major version. Use componentDidMount instead. As a temporary workaround, you can rename to UNSAFE_componentWillMount.

Learn more about this warning here:
https://fb.me/react-async-component-lifecycle-hooks

[tathagat2006]

@hannes-o-brunner Are you working on this issue? Else I would like to work on this one.

[hannes-o-brunner]

No, not working on it, you can take it

[interactivellama]

Sounds awesome! Thank you. This PR may be helpful #2245

[tathagat2006]

Great! Thanks @hannes-o-brunner @interactivellama

[stale]

This issue has been automatically marked as stale, because it has not had recent activity. It will be closed if no further activity occurs. Maintainers are responsible for tech debt and project health. This is most likely a new components or component feature request. Please submit a pull request for or request feedback on this feature. Thank you.

[interactivellama]

I believe this is fixed by #2830