refactor(tier4_planning_rviz_plugin): apply clang-tidy for mission_checkpoint

[h-ohta]

Description

• apply clang-tidy for mission_checkpoint

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[codecov]

Codecov Report

Merging #1634 (7f9aed6) into main (d47adcc) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1634   +/-   ##
=======================================
  Coverage   10.71%   10.71%           
=======================================
  Files        1109     1109           
  Lines       78447    78447           
  Branches    18547    18547           
=======================================
  Hits         8403     8403           
  Misses      61184    61184           
  Partials     8860     8860           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	10.69% <0.00%> (ø)		Carriedforward from d47adcc

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
.../include/mission_checkpoint/mission_checkpoint.hpp	0.00% <0.00%> (ø)
...clude/planning_debug_tools/trajectory_analyzer.hpp	0.00% <0.00%> (ø)
..._debug_tools/include/planning_debug_tools/util.hpp	0.00% <0.00%> (ø)

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[yukkysaito]

LGTM