Add cleanup function for SITL Gazebo on macOS #2331

Job	Run time
Scan for Board Targets	36s
Build Group [base-px4]	5m 16s
Build Group [nuttx-cuav]	7m 22s
Build Group [nuttx-cubepilot]	8m 34s
Build Group [nuttx-nxp-0]	12m 22s
Build Group [nuttx-nxp-1]	3m 38s
Build Group [nuttx-px4-0]	13m 11s
Build Group [nuttx-px4-1]	13m 28s
Build Group [nuttx-px4-2]	9m 47s
Build Group [nuttx-px4-3]	8m 6s
Build Group [nuttx-holybro-0]	9m 15s
Build Group [nuttx-holybro-1]	4m 59s
Build Group [nuttx-micoair]	5m 28s
Build Group [nuttx-ark-0]	8m 35s
Build Group [nuttx-ark-1]	4m 25s
Build Group [nuttx-matek]	7m 4s
Build Group [nuttx-mro-0]	10m 11s
Build Group [nuttx-mro-1]	3m 11s
Build Group [nuttx-0]	12m 28s
Build Group [nuttx-1]	8m 40s
Build Group [nuttx-2]	10m 38s
Build Group [nuttx-3]	5m 12s
Build Group [armhf-0]	4m 51s
Build Group [aarch64-0]	2m 20s
Create Release and Upload Artifacts	0s
Upload Artifacts to S3	0s
	2h 59m 37s

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