- revert some changes of SpecularReflectionPositionCorrect2 (but keep all const changes)
- add new method addSampleLogs to LoadILLReflectometry, sample log of two theta not complete for user given angle
- use m_sampleAngleName for FIGARO (many occasions in code where this name is used)
- in ReflectometryILLPreprocess(Test):
  - in case of user given two theta: need to write this to the sample logs
  - use loader with fixed two theta and line position to avoid peak fitting and final detector rotation
  - handle LinePosition input properly when moving the detector (only needed if two theta is user given)
  - provide FIGARO's deflection angle (added a method to common since it handles NeXus variable names)
  - import and use numpy.full in PreProcess test to improve the test in terms of shape and type of the values. Get blocksize() outside loop.
  - CalculatePolynomialBackground failed often during testing and it was not easy to adapt the test, deleted background offset and width input properties -> cleanup still tested fully
  - replaced use of getLogData by getProperty

Refs #24123