Update runHealthCheck Flow plugin to leverage GPU workers

[cgprats]

Currently there is no mechanism to add the hwaccel flags for GPU workers.

• -hwaccel nvdec -hwaccel_output_format cuda on NVIDIA
• -hwaccel vaapi -hwaccel_output_format vaapi on VAAPI/QSV

This dramatically increases CPU usage when running health checks as part of a flow instead of a traditional health check (which properly handles GPU workers).

Ideally these flags would be automatically determined by the plugin, but a drop down with none/qsv/nvidia (or similar) would probably be good enough.