delete WorkbenchCommandSupport "API is scheduled for deletion" #2277

Job	Run time
check-freeze-period / verify-freeze-period	1s
build / Upload Event File	2s
build / Verify Linux	22m 24s
check-merge-commits / Block Merge Commits	7s
build / Verify Windows	31m 46s
build / Verify MacOS	1h 15m 29s
	2h 9m 49s

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