Fix slot number determination logic for the FIB workflow

[tieneupin]

In the Aquilos, the stage rotation value will be set to -75 degrees during normal milling and when acquiring SEM images. The xy coordinates at this rotation value are used to identify the slot number.

The xy coordinates needed to keep the same region in view will change as the stage is rotated, so a transformation matrix will need to be applied using the xy coordinates and the current rotation value to determine what the xy coordinates of the viewed region will be at the standard viewing/milling angle, and thus what slot number it belongs to.

This PR adds the coordinate transformation logic needed to determine the slot number to the StagePosittionValues Pydantic model, and updates the relevant tests accordingly.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.48%. Comparing base (c85221f) to head (f52b8e6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #842      +/-   ##
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+ Coverage   53.47%   53.48%   +0.01%     
==========================================
  Files         103      103              
  Lines       11071    11075       +4     
  Branches     1476     1476              
==========================================
+ Hits         5920     5924       +4     
  Misses       4831     4831              
  Partials      320      320              

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