Add e2e tests to PR tests

• Add e2e tests to pipeline
• Set up server directory that holds instance of QPlan to be started and used in e2e tests - This is because e2e tests need live instance, using the deployed instance won't work for obvious reasons. Use an existing test directory is better than a temp directory that is deleted each time because the front end install and build takes too long.
• investigate if e2e tests need a live back end as well, if not don't bother running back end.