Because of the parallelism of the tests,
the authentication setup was flaky. Sometimes
the tests would run before the authentication
was complete.
We change to a global setup instead of the
project dependency setup, it should be more
reliable.
We improved the waiting states of the authentication
setup.
To speed up pull request flow, put e2e tests
only mandatory for Chrome.
We still have tests for Firefox and Webkit,
but they are not mandatory.
They will still have to be checked regularly,
particularly during the deployment phase.
