Add warning in server renderer if class doesn't extend React.Component (#11993)

* Add warning in server renderer if class doesn't extend React.Component

In dev mode, while server rendering, a warning will be thrown if there is a class that doesn't extend React.Component.

* Use `.toWarnDev` matcher and deduplicate warnings

* Deduplicate client-side warning if class doesn't extend React.Component

* Default componentName to Unknown if null