Use isNewRevision() in EntityUsageTrackBase::trackOnEntityUpdate() to detect new revisions [#3582425]

EntityUsageTrackBase::trackOnEntityUpdate() currently detects “new revision” by comparing revision IDs with $source_entity->original.
The proposed change uses isNewRevision() as the primary signal. This is a better and more explicit way to detect revision creation, independent from original state.

Issue fork entity_usage-3582425

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3582425-use-isnewrevision-in changes, plain diff MR !176
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