Migrate remaining tests to react-testing-library, and remove Enzyme (#…

…486)

This finally allows us to remove the dependency on Enzyme.

Also as part of this PR:

- Removed components
  - LaunchbarContainer (serves no purpose)
  - Account (not used)
  - SpeciesTab (superseded by SelectedSpecies component; not used anywhere)
- Removed tests for Launchbar
- Removed the launchbarExpanded and accountExpanded fields from redux and from components
- Changed the keyCode field on KeyboardEvent to event.key
   (typescript marks it as deprecated, whereas Browser support seems to be good these days).

src/ensembl/jest.config.js

@@ -12,7 +12,6 @@ module.exports = {
   roots: ['<rootDir>/src'],
   setupFiles: ['<rootDir>/tests/setup-jest.js'],
   setupFilesAfterEnv: [
-    '<rootDir>/tests/setup-enzyme.ts',
     '<rootDir>/tests/setup-rtl.ts'
   ],
   testEnvironment: 'jsdom',