Removed OPBPMNValidationWorkbench (unused) #330

Job	Run time
plugins / Build Linux	4m 27s
plugins / Build Mac M1	3m 58s
plugins / Build Windows	5m 40s
plugins / Build Mac Intel	4m 45s
plugins / Check Mac M1 zip is created	3s
plugins / Check Linux zip is created	2s
plugins / Check Mac Intel zip is created	6s
plugins / Check Windows zip is created	2s
plugins / Save dl stats of previous build	8s
plugins / Re-create release	6s
plugins / Upload Mac Intel zip	4s
plugins / Upload Mac M1 zip	5s
plugins / Upload Linux zip	5s
plugins / Find dependent repositories	3s
plugins / Upload Windows zip	5s
plugins / Build dependent (OpenPonk/plugins, master, true)	2s
	19m 41s

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