ekf2: migrate uorb events to events interface #1891

Job	Run time
Scan for Board Targets	33s
Build Group [base-px4]	5m 16s
Build Group [nuttx-cubepilot]	8m 11s
Build Group [nuttx-px4-0]	11m 38s
Build Group [nuttx-px4-1]	10m 42s
Build Group [nuttx-px4-2]	12m 44s
Build Group [nuttx-px4-3]	7m 2s
Build Group [nuttx-matek]	6m 53s
Build Group [nuttx-holybro-0]	9m 18s
Build Group [nuttx-holybro-1]	4m 45s
Build Group [nuttx-mro-0]	10m 30s
Build Group [nuttx-mro-1]	3m 17s
Build Group [nuttx-nxp-0]	10m 43s
Build Group [nuttx-nxp-1]	4m 10s
Build Group [nuttx-ark-0]	8m 0s
Build Group [nuttx-ark-1]	3m 51s
Build Group [nuttx-cuav]	7m 2s
Build Group [nuttx-0]	10m 55s
Build Group [nuttx-1]	10m 9s
Build Group [nuttx-2]	8m 57s
Build Group [nuttx-3]	8m 2s
Build Group [armhf-0]	4m 28s
Build Group [aarch64-0]	1m 52s
Create Release and Upload Artifacts	0s
Upload Artifacts to S3	0s
	2h 48m 58s

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