Enable to skip update checks from pom properties

Follow up of https://github.com/GoogleContainerTools/jib/issues/3350#issuecomment-885058082 since it is really bothering to not be able to disable update check for project in time - when you don't work on a single "everyday" project and disabling it globally is rarely the desired behavior (it is really a per project thing) but the properties were not read as expected so this PR ensures it is the case.

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Fixes # 🛠️

GoogleContainerTools / jib

Enable to skip update checks from pom properties #4212