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
• [x] MosaicRenderPreview https://github.com/ProjectMirador/mirador/pull/3960
• [ ] BackgroundPluginArea https://github.com/ProjectMirador/mirador/pull/3955
• [ ] LazyLoadedImage https://github.com/ProjectMirador/mirador/pull/3957

[jcoyne]

I think we'll want https://github.com/ProjectMirador/mirador/pull/3958 too.