Maintenance: fix findDOMNode and defaultProps console warnings

[marlo-longley]

There are a ton of these cluttering the console.

Warning: Connect(WithPlugins(Window)): Support for defaultProps will be removed from memo components in a future major release. Use JavaScript default parameters instead.

and

 Warning: findDOMNode is deprecated and will be removed in the next major release. Instead, add a ref directly to the element you want to reference. Learn more about using refs safely here: https://reactjs.org/link/strict-mode-find-node

[marlo-longley]

defaultProps problem components:

• PluginProvider
• MiradorMenuButton
• MosaicRenderPreview Stop using defaultProps in MosaicRenderPreview component #3960
• BackgroundPluginArea Stop using default props in BackgroundPluginArea #3955
• LazyLoadedImage Stop using defaultProps for LazyLoadedImage #3957

[jcoyne]

I think we'll want #3958 too.