Set up Jest component tests for JSX packages

[AlanSl]

I've updated this and it should now be good to go:

• [x] Updated against latest Master, fixing some tests for things that were renamed
• [x] Fixed some issues with the root scripts:
  • Stopped root update-snapshots failing in non-Jest packages
  • Run prepare in packages that support it, so latest builds are used when packages pull each other in
• [x] Rejigged dependencies to avoid a horrible Jest bug-feature that was causing catalogue and shell tests to fail with "Invalid hook calls" because Jest's module resolver doesn't treat peer dependencies like real resolvers do and always looks in the root node_modules, causing multiple instances of React when importing from the package that was intended to provide React to all the peer deps
• [x] Used the root repo babel config file for Jest rather than having a config file in each package
• [x] Removing stray package-locks created after npm was used in various places and disabling package-lock to prevent clashes with Yarn

[AlanSl]

After having spent some time writing tests building on this, I've found it needs some major changes to better support tests involving context trees being updated by events, so I'm closing this for a fork https://github.com/nearform/libp2p-introspection-ui/pull/32 which adapts this to use a customised react-testing-library