fix(autoware_pointcloud_preprocessor): fix unusedFunction

[kobayu858]

Description

This is a fix based on cppcheck unusedFunction warnings.

sensing/autoware_pointcloud_preprocessor/src/downsample_filter/robin_hood.h:344:0: style: The function 'rotr' is never used. [unusedFunction]
T rotr(T x, unsigned k)
^

sensing/autoware_pointcloud_preprocessor/src/downsample_filter/robin_hood.h:1935:0: style: The function 'emplace_hint' is never used. [unusedFunction]
  iterator emplace_hint(const const_iterator & position, Args &&... args)
^

sensing/autoware_pointcloud_preprocessor/src/downsample_filter/robin_hood.h:2180:0: style: The function 'rehash' is never used. [unusedFunction]
  void rehash(size_t c)
^

sensing/autoware_pointcloud_preprocessor/src/downsample_filter/robin_hood.h:2196:0: style: The function 'compact' is never used. [unusedFunction]
  void compact()
^

sensing/autoware_pointcloud_preprocessor/src/downsample_filter/robin_hood.h:2234:0: style: The function 'max_load_factor' is never used. [unusedFunction]
  float max_load_factor() const noexcept
^

sensing/autoware_pointcloud_preprocessor/src/downsample_filter/robin_hood.h:2241:0: style: The function 'load_factor' is never used. [unusedFunction]
  float load_factor() const noexcept
^

Related links

Parent Issue:

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How was this PR tested?

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 24.19%. Comparing base (7011ea1) to head (48cbd0d).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8673      +/-   ##
==========================================
- Coverage   24.19%   24.19%   -0.01%     
==========================================
  Files        1400     1402       +2     
  Lines      102131   102166      +35     
  Branches    38779    38783       +4     
==========================================
+ Hits        24710    24714       +4     
- Misses      74917    74949      +32     
+ Partials     2504     2503       -1     

Flag	Coverage Δ		*Carryforward flag
differential	18.76% <ø> (?)
total	24.19% <ø> (ø)		Carriedforward from 7011ea1

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[YoshiRi]

@yukkysaito could you take a look at this pr?

[yukkysaito]

LGTM

Since this code is based on the existing one, it might be better not to introduce too many differences.
https://github.com/martinus/robin-hood-hashing