Bugfix: dond uses the correct register_name for shapes

[samantha-ho]

This PR updates the detect_shape_of_measurement and _register_parameter utility functions used to infer the correct shape of Parameters, and particularly ParameterWithSetpoints, to use register_name instead of full_name. Since these parameters are registered by register_name, this mismatch can cause datasets to fail to infer or use the data shape correctly.

Closes #7198

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.94%. Comparing base (9d34a0b) to head (bbf4cc2).
Report is 24 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7199   +/-   ##
=======================================
  Coverage   59.94%   59.94%           
=======================================
  Files         342      342           
  Lines       31517    31517           
=======================================
  Hits        18893    18893           
  Misses      12624    12624           

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