Switch front end tests to use EGL

[jrtcppv]

Playback performance in front end tests is poor due to having no graphics acceleration. It was found that running them on an EC2 g4dn.2xlarge instance using an AMI with NICE DCV and with --use-gl=egl when invoking chrome resulted in performance similar to a client with an IGPU. To enable testing that requires high performance playback, switch front end tests to use an EC2 instance instead of a CircleCI node.