Update bext e2e tests
Created by: erzhtor
Fixes bext failing e2e tests due to https://github.com/sourcegraph/sourcegraph/pull/26892.
I could not run bext e2e tests locally, chrome is weirdly blocking bext with
Error: net::ERR_BLOCKED_BY_CLIENT at chrome-extension://bmfbcejdknlknpncfpeloejonjoledha/options.html
. But I belive, this should fix failing tests.