fix(autoware_ndt_scan_matcher): fix cppcheck unusedFunction

[veqcc]

Description

This is a fix based on cppcheck warning unusedFunction

localization/autoware_ndt_scan_matcher/src/ndt_omp/estimate_covariance.cpp:106:0: style: The function 'find_rotation_matrix_aligning_covariance_to_principal_axes' is never used. [unusedFunction]
Eigen::Matrix2d find_rotation_matrix_aligning_covariance_to_principal_axes(
^

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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 29.25%. Comparing base (1ea45e6) to head (99c5777).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9275   +/-   ##
=======================================
  Coverage   29.24%   29.25%           
=======================================
  Files        1336     1336           
  Lines      102981   102986    +5     
  Branches    39958    39957    -1     
=======================================
+ Hits        30117    30126    +9     
+ Misses      69989    69984    -5     
- Partials     2875     2876    +1     

Flag	Coverage Δ		*Carryforward flag
differential	26.64% <ø> (?)
total	29.24% <ø> (+<0.01%)	⬆️	Carriedforward from 1ea45e6

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[SakodaShintaro]

Thanks. LGTM