Removed NEXUS_USERNAME and NEXUS_PASSWORD on Jenkins DeploymentConfig as are no longer used #3681

Job	Run time
Jenkins agent base tests	2m 2s
Verify Go tests are formatted and can be compiled	38s
Verify clone script requirements	5s
Create Projects tests	6s
Jenkins master tests	44s
Nexus tests	7s
SonarQube tests (9.9.4, community)	1m 0s
Webhook Proxy tests	40s
SonarQube tests (9.9.4, developer)	1m 13s
SonarQube tests (9.9.4, enterprise)	1m 11s
	7m 46s

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