GEC-6 Use common run_dp3 function for (Bda)DdeCal tests

Maik Nijhuisrequested to merge
gec-6-tddecal into master

Using a common run_dp3() function removes duplicate code between Python tests.

This MR only updates tDDECal.py and tBdaDdeCal.py. Follow-up MRs can update the other tests.

Edited by Maik Nijhuis

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