Add ui tests to showcase bug with saving of files with DOS line endings #449
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Added a failing test and a passing test to showcase how the collab save functionality is broken for dos files (files with dos line endings with a carriage return).
See issue (#448) for full details.
Bug behaviour (video taken directly from UI test failure):
f115b213aac2233742500c393c6e6033c6d27bfd.webm
Also updated the UI readme so a new contributor can get started running tests straight away as the old README didn't work without a running jupyterlab instance manually (not documented in the README).