Replace global classes with data-testid in browser end-to-end tests
Created by: gitstart-sourcegraph
Description
Replace global classes with data-testid
in browser end-to-end tests
Refs
GitStart Ticket SourceGraph Issue
Success criteria
Global CSS classes except for .test-*
used in end-to-end tests are replaced with data-testid
attributes. Relevant file: client/browser/src/end-to-end/*.test.ts