Revamp build error page

[williamjallen]

This PR completely redesigns the build error page, using the GraphQL API to support a brand new UI. The route has been changed to /builds/<id>/errors with appropriate redirects, and the legacy /api/v1/viewBuildError.php API endpoint has been deprecated.

Before	After

[josephsnyder]

The update to the page looks good and is a great update.
I have one request that I'm definitely willing to make future work:

I think it would benefit us to collapse the "Standard Output" automatically if there were more than 50 lines of output. One of the Sacado subproject has 267 warnings each with long diffs and it takes over the whole page. I would also be fine if we had the equivalent of the original page which had a limited size box, each with its own scroll bar instead of adding to the length of the overall page

[williamjallen]

@josephsnyder Done. Stdout more than 20 lines long is now hidden by default. In the future, this could probably be improved by showing the first 20 lines and adding a "show more" widget instead.

[josephsnyder]

@williamjallen, it seems like all stdout is hidden by default. There are several warnings of 2 or 3 lines that are closed automatically

[williamjallen]

@josephsnyder Should be better now.

[josephsnyder]

Definitely better. Thanks for the quick updates!