EMC ClustersTrend should publish only complete trends

[knopers8]

EMC ClustersTrend configuration is changed to publish trends only once all input objects are processed, there is no need for intermediate versions.

[github-actions]

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[knopers8]

@davidrohr , @shahor02 , @chiarazampolli could one of you review this PR please?

[JianLIUhep]

Hi @catalinristea, @alcaliva, the EMC trending task is publishing a large number of objects to QCDB, and we are running out of space on the QCDB server.

Could you please take this PR for all the upcoming productions?

Thank you.