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Plus, make sure to render the history buttons regardless of whether related articles are present

Also, update the svg images for all launchbar icons,
and add dedicated React components for these icons

* Update to react-router v.6

* Update redux-observable to 2.0.0

* Rebase dev and replace calls to connected-react-router with calls to navigate

* Another round of dependency updates

* Clean up App.tsx

* Update the api of the useUrlParams hook

- Fix BrowserImage tests
- Mock focusObjectSlice, which depends on thoasApiSlice, in useBrowserRouting tests

Plus, clear the genome browser when BrowserImage component is unmounted

Co-authored-by: Andrey Azov <andrey@ebi.ac.uk>

Co-authored-by: Imran Salam <imran@ebi.ac.uk>
Co-authored-by: Kamal Dodiya <40833799+kamaldodiya@users.noreply.github.com>
Co-authored-by: Andrey Azov <andrey@ebi.ac.uk>

Also, update typescript to 4.5

- Delete ensemblRoot from client-side code
- Replace ensemblRoot with webpackDir
- Remove dotenv packages and .env files

- Refactor the drawer redux slice to use redux-toolkit
- Change the shape of the redux slice responsible for the genome browser drawer,
   such that the name of the drawer view is co-located with the data required to render this view
- Remove explicit isDrawerOpened flag

- Refactor TrackPanelList items
  Instead of a single TrackPanelItem component, create purely presentational components
  to maintain the layout, as well as higher-order components for different types of tracks
  (TrackPanelGene, TrackPanelTranscript, TrackPanelTranscriptGroup, and TrackPanelRegularItem)

- When track panel gene is collapsed, show the number of transcripts that this gene has.

Also:

- add redux-thunk to package.json
- add terser-webpack-plugin to package.json
- update webpack, webpack-cli and workbox-webpack-plugin to resolve the error
  "Error: Cannot find module 'workbox-build/build/options/schema/webpack-generate-sw'"
  occurring during the production build