e2e: add kludge to see if this fixes flakes
Created by: ggilmore
We've been experiencing constant flakiness from our e2e tests for the past few days.
In https://github.com/sourcegraph/sourcegraph/issues/7212#issuecomment-566101552, @lguychard noticed some oddities with the base sourcegraph URL changing in the middle of the test suite. This PR adds a kludge to see if hard coding the sourcegraph URL to always be http://localhost:7080
(no matter what the BASE_SOURCEGRAPH_URL
env var is set to) fixes the flakiness.
Note that if this actually fixes the flakes, then there might be a real race condition in Sourcegraph itself and merging this PR only hides the underlying problem.