fix(autoware_freespace_planning_algorithms): fix unusedScopedObject bug

[veqcc]

Description

This is a fix based on cppcheck unusedScopedObject warning

planning/autoware_freespace_planning_algorithms/src/abstract_algorithm.cpp:94:10: style: Instance of 'std::runtime_error' object is destroyed immediately. [unusedScopedObject]
    std::runtime_error("cannot compute cost because waypoint has size 0");
         ^

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

Interface changes

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 15.30%. Comparing base (507e3f4) to head (4b3612a).
Report is 49 commits behind head on main.

Files	Patch %	Lines
...ace_planning_algorithms/src/abstract_algorithm.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7562      +/-   ##
==========================================
+ Coverage   14.84%   15.30%   +0.45%     
==========================================
  Files        1999      528    -1471     
  Lines      139163    48964   -90199     
  Branches    43716    12228   -31488     
==========================================
- Hits        20661     7493   -13168     
+ Misses      95731    40449   -55282     
+ Partials    22771     1022   -21749     

Flag	Coverage Δ
differential	15.30% <0.00%> (?)
total	?

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