Use tolerances in beamline parameters file for aperture scatterguard

[DominicOram]

For the aperture scatterguard to be in position we currently use the motor tolerances, we should instead use those in the beamline parameters file see https://diamondlightsource.slack.com/archives/C048RD0KFFF/p1714579073626219

Acceptance Criteria

• Tolerances from beamline parameters file are used in the aperture/scatterguard

[dperl-dls]

Should there be signals for this or just attributes?

[DominicOram]

• Signal for outside device, attribute otherwise. This is an attribute as will only be internal
• We already read the file, need to get the tolerances out as well as positions and use those
• This is just aperture scatterguard for now, ignore the other tolerances in this file
• Small