Gitlab: unable to file information (no-commit-sha)

Created by: lguychard

From Sentry: https://sentry.io/organizations/sourcegraph/issues/977193390/?project=1334031&query=is%3Aunresolved+extension_version%3A19.10.9.1226+extension_version%3A19.10.9.1226&statsPeriod=14d

I've reproduced this on https://gitlab.com/gitlab-org/gitlab-foss/merge_requests/30574/diffs, seems like the Gitlab DOM has changed and there is no longer a '.file-actions .commit-sha' in diff code views.