Refactor build.php API endpoint

[williamjallen]

This PR continues our ongoing effort to modernize the codebase by migrating the legacy API files to Laravel controllers.

[josephsnyder]

@williamjallen, I'm having trouble getting anything back from the API, the new ones return just [ ] but the old version seems to return blank on my test instance. Are you able to get data in your test system?

[josephsnyder]

With the knowledge that the get call here returns nothing back to the screen as it does in the master branch, it LGTM.

ETA: Blank return when adding no parameters to the api call (build.php?buildid=1). Data is properly returned for further queries (build.php?buildid=1&getproblems=1)

[williamjallen]

As discussed face-to-face, this endpoint is somewhat broken. My refactor only attempts to match the current behavior rather than fixing any of the issues. This endpoint is one of the first I plan to deprecate once #1772 is merged.