Enable workbench-session-init release target #6079

Job	Run time
Fetch product daily/preview versions	10s
Connect Content Init - Daily	2m 9s
Connect - Daily	10m 19s
Base Image Previews	9m 33s
Package Manager - Preview	7m 24s
Package Manager - Daily	7m 12s
R Session Complete - Daily	11m 51s
R Session Complete - Preview	12m 17s
Workbench - Daily	13m 33s
Workbench - Preview	13m 10s
Workbench Session Init - Daily	30s
	1h 28m 8s

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