[FLINK-12997][coordination] Release partitions when a vertex is reset

[zentol]

If an execution finishes it doesn not issue release calls for partitions as they could be re-used later. If the corresponding vertex is reset however we still have to release the partitions that the (now old) execution produced.

This PR implements this behavior.

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[GJL]

maybe break the line between method calls for consistency

[GJL]

Not sure if we need to include priorExecutionGraph in the builder. I cannot find a usage of buildGraph() where prior is non-null.