Cleanup of EmuStepProcessing test and fix of serial merging and noL1 chains (repeat)
This MR is repeating !32130 (closed), which had problems in the merging. Same fixes included:
- Modified some emulation chains to test different behaviours (so ref changed)
- fixed way of retrieving decisions in __decisionsFromHypo
- fixed FSNOSEED seeding
- fixed serial noL1 chain