Mattermost-server: Remove deprecated lifecycle methods from settings screens

[mattermod]

The following React lifecycle methods have been deprecated by React and will start to be removed starting in React 17:

• componentWillMount
• componentWillReceiveProps
• componentWillUpdate

The React team has published a guide discussing the changes and how to migrate to the new lifecycle methods here: https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html

As part of a campaign to remove these methods from https://github.com/mattermost/mattermost-mobile, these methods should be replaced in the following files:

• app/screens/settings/notification_settings_mobile/notification_settings_mobile.android.js
• app/screens/settings/notification_settings/notification_settings.js
• app/screens/settings/notification_settings_email/notification_settings_email_base.js
• app/components/radio_button/radio_button_group.js

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JIRA: https://mattermost.atlassian.net/browse/MM-18765

[GunnlaugurCalvi]

I have a PR for this issue

[jespino]

Awesome, Thanks @GunnlaugurCalvi!

[enahum]

Ticket was re-opened

[RominHalltari]

Can I start working on this?

[enahum]

@RominHalltari absolutely, go ahead

[hanzei]

Making this available for the public again. Please let me know if you still want to work on it @RominHalltari

[rahimrahman]

I'm already working on #12353. It make sense to me to take this on as well.

[rahimrahman]

@migbot I was away for a while and finally wrapping up 12353. I still plan on working on this.