fix(traffic_light_utils): fix unusedFunction

[kobayu858]

Description

This is a fix based on cppcheck unusedFunction warnings.

common/traffic_light_utils/src/traffic_light_utils.cpp:20:0: style: The function 'isRoiValid' is never used. [unusedFunction]
bool isRoiValid(
^

common/traffic_light_utils/src/traffic_light_utils.cpp:31:0: style: The function 'setRoiInvalid' is never used. [unusedFunction]
void setRoiInvalid(tier4_perception_msgs::msg::TrafficLightRoi & roi)
^

common/traffic_light_utils/src/traffic_light_utils.cpp:36:0: style: The function 'isSignalUnknown' is never used. [unusedFunction]
bool isSignalUnknown(const tier4_perception_msgs::msg::TrafficLight & signal)
^

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 24.05%. Comparing base (b9b0fa9) to head (ea74583).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8605      +/-   ##
==========================================
- Coverage   24.06%   24.05%   -0.02%     
==========================================
  Files        1398     1402       +4     
  Lines      102639   102655      +16     
  Branches    39023    39019       -4     
==========================================
- Hits        24704    24692      -12     
- Misses      75403    75431      +28     
  Partials     2532     2532              

Flag	Coverage Δ		*Carryforward flag
differential	21.19% <ø> (?)
total	24.05% <ø> (-0.01%)	⬇️	Carriedforward from b9b0fa9

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