fix(interpolation): fix unusedFunction

[Nagi70]

Description

This is a fix based on cppcheck unusedFunction warnings

common/interpolation/src/spline_interpolation_points_2d.cpp:74:0: style: The function 'slerp2dFromXY' is never used. [unusedFunction]
std::array<std::vector<double>, 3> slerp2dFromXY(
^

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Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.88%. Comparing base (9a461b4) to head (14be43f).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8522      +/-   ##
==========================================
- Coverage   23.90%   23.88%   -0.02%     
==========================================
  Files        1381     1384       +3     
  Lines      101923   101940      +17     
  Branches    38808    38816       +8     
==========================================
- Hits        24363    24351      -12     
- Misses      75116    75117       +1     
- Partials     2444     2472      +28     

Flag	Coverage Δ		*Carryforward flag
differential	23.41% <ø> (?)
total	23.89% <ø> (-0.01%)	⬇️	Carriedforward from bfcd161

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