Test

Add scaling tests #745

Job	Run time
RunTests (mir_kiosk, stable)	4m 17s
RunTests (ubuntu_frame, stable)	6m 47s
RunTests (mir_test_tools, stable)	8m 1s
RunTests (ubuntu_frame, 24/edge)	7m 24s
RunTests (mir_test_tools, 24/edge)	7m 2s
RunTests (mir_demo_server)	7m 0s
RunTests (mir_demo_server, mir-team/dev)	5m 58s
RunTests (confined_shell, beta)	7m 4s
RunTests (confined_shell, edge)	7m 30s
RunTests (gnome_shell)	24m 28s
RunTests (self)	24m 28s
ProcessArtifacts	8s
	1h 50m 7s

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