Fix different json representation in scheduling mechanism #7519
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Describe your changes
The scenario graph stored as json in the db tables of the scheduling mechanism is different, than the one stored in process_versions table. It is already pre-resolved, for example fragments are expanded. The previous change in the periodic mechanism did not take that into account and was incorrent. We need to store this pre-resolved json. But there is one optimization possible, and now introduced in this PR in the new tables - cleaning this json when scenario is cancelled.
Checklist before merge