Fail visual and update screenshots jobs if any stories fail
@peterhegman noticed in !2833 (merged) that some storyshots weren't getting created.
It turned out the the update_screenshots
job logged an error, but did not fail:
console.error
Unexpected error while loading ./components/base/avatar_labeled/avatar_labeled.stories.js: Invalid or unexpected token
/builds/gitlab-org/gitlab-ui/static/img/avatar.png:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){�PNG
This issue is about making the test:visual*
and update_screenshots
jobs fail if any stories fail like this.