remove manual DCO check (done by org-level check) (backport 2.x) #190

Job	Run time
Build and Test Plugin Template (ubuntu-latest, 17)	1m 46s
Build and Test Plugin Template (ubuntu-latest, 17)	1m 46s
Build and Test Plugin Template (ubuntu-latest, 17)	1m 46s
Build and Test Plugin Template (ubuntu-latest, 21)	2m 20s
Build and Test Plugin Template (ubuntu-latest, 21)	2m 20s
Build and Test Plugin Template (ubuntu-latest, 21)	2m 20s
Build and Test Plugin Template (macOS-latest, 17)	3m 39s
Build and Test Plugin Template (macOS-latest, 17)	3m 26s
Build and Test Plugin Template (macOS-latest, 17)	3m 26s
Build and Test Plugin Template (macOS-latest, 21)	3m 40s
Build and Test Plugin Template (macOS-latest, 21)	3m 28s
Build and Test Plugin Template (macOS-latest, 21)	3m 28s
Build and Test Plugin Template (windows-latest, 17)	3m 24s
Build and Test Plugin Template (windows-latest, 17)	5m 17s
Build and Test Plugin Template (windows-latest, 17)	3m 4s
Build and Test Plugin Template (windows-latest, 21)	3m 17s
Build and Test Plugin Template (windows-latest, 21)	3m 28s
Build and Test Plugin Template (windows-latest, 21)	3m 28s
	55m 23s

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