Change 21215

Paul Allen
Polling fix for Multi client support in Pipeline.

Jenkins polls for each SCM checkout, so must poll each workplace and therefore need to lookup last build information for each sync.
Polling now uses same lookup as Change Summary.

Added extra test cases multi sync poll and poll again.

JENKINS-38401
JENKINS-37462
JENKINS-39652
4 edited 0 added 0 deleted
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