Change 27175

Paul Allen
Prevent dormant multi branch project continiously building. JENKINS-63494 and JENKINS-64193

When scanning a multi branch project if the history of changes is outside of the `Head change query limit` then no changes are found.  The old behaviour used the latest change and triggered a build; continuously triggering dormant projects with each new submit. 

The new behaviour uses the last build change if no changes are found (preventing a triggered build) or if there was no previous builds (in the case of new projects) then the latest changes is used to triggering a build.
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