Fix for nonGSF chains instantiating GSF track refit
This is to implement a fix in the electron menu when noGSF chains were instntiating GSF refitting when they should have not.
Its based on an idea by @dbakshig in this draft MR !55429 (closed). In summary:
- GSF and nonGSF chains had different length as GSF chains had an additional step
- We are adding an empty step for nonGSF chains where GSF chains have a track reffiting after precision TRacking
- PrecisionElectron becomes now Step6
- Added Step number in the comments of the ElectronConfiguration python file to make it easier the follow up of what is running where for future developers