GDA-5807 the logic in determineScannableValuesAtFeature is wrong

and I am not quite clear why there is interpolation going on.
The feature finding would have picked that up, right?
Merge branch '8.36' of ssh://dasc-git.diamond.ac.uk/gda/gda-core into 8.36
Merge branch '8.36' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.36
Merge branch '8.36' of ssh://dasc-git.diamond.ac.uk/gda/gda-core into 8.36
Merge branch '8.36' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.36
Merge branch '8.36' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.36
Merge branch '8.36' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.36
Merge branch '8.36' of ssh://dascgitolite@dasc-git.diamond.ac.uk/gda/gda-core.git into 8.36
synchronise configureScanNumber to prevent skipping numbers
Merge remote branch 'i05/8.36' into 8.36