Run webdriver-manager on PRs for e2e tests
Run webdriver-manager on PRs for e2e tests

Browserstack remote service doesn't work on PRs, because the browserstack key
is not exposed. Use webdriver-manager instead for that.


Former-commit-id: a4b89f47f0d7021a009aad51c12e9edda54598dd
cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend,alisman/cbioportal-frontend,alisman/cbioportal-frontend,cBioPortal/cbioportal-frontend