chore: e2e tests

[niallthomson]

We run e2e tests as part of PR checks, which currently is just the default test code scaffolded by create-app. This should be extended to test the plugins in this repository.

AWS API calls could be handled either by:

1. Making real calls to the AWS APIs - this would likely not be run as part of PR checks but would be useful to have
2. Using the mocks we already have - this could be run as part of PR checks