Fix race condition in tests

Tests were trying to write to the same output files, which sometimes causes corruptions and failures in the validators.

DaVinciExamples/python/DaVinciExamples/tupling/example-tupling-basic-run-mc.yaml

@@ -11,8 +11,8 @@
 
 enable_unpack: False
 evt_max: 10
-histo_file: 'DV-example-tupling-basic-his.root'
+histo_file: 'DV-example-tupling-basic-his-run-mc.root'
 input_raw_format: 4.3
 lumi: False
-ntuple_file: 'DV-example-tupling-basic-ntp.root'
+ntuple_file: 'DV-example-tupling-basic-ntp-run-mc.root'
 process: 'Turbo'