Xcode Test for iOS add xcbeautify as build output tool


Currently the Xcode Test for iOS only allows xcpretty or Xcode build as the output tool. Xcpretty does not work with parallel tests output and xcodebuild just gives a summary of the last 20 lunes from the log.

Instead we would like to use xcbeautify as the output tool but it is not an option on the current configuration. https://github.com/thii/xcbeautify

Could support be added for this?