feat(traffic_light_classifier): update diagnostics when harsh backlight is detected

[ktro2828]

Description

This PR introduces diagnostics publisher in order to warn if any classifications are overwritten by UNKNOWN when harsh backlight are detected.

Related links

Parent Issue:

• Link

How was this PR tested?

Notes for reviewers

None.

Interface changes

Change type	Topic Type	Topic Name	Message Type	Description
Added	Pub	/diagnostics	diagnostic_msgs/msg/DiagnosticArray	Topic description

Effects on system behavior

None.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 26.55%. Comparing base (1b37970) to head (ccc5e67).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...t_classifier/src/traffic_light_classifier_node.cpp	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10218      +/-   ##
==========================================
+ Coverage   26.26%   26.55%   +0.29%     
==========================================
  Files        1378     1385       +7     
  Lines      107444   106982     -462     
  Branches    41426    41053     -373     
==========================================
+ Hits        28221    28410     +189     
+ Misses      76403    75742     -661     
- Partials     2820     2830      +10     

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
differential-cuda	0.00% <0.00%> (?)
total	26.56% <ø> (+0.29%)	⬆️	Carriedforward from 11d6b0c

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

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[MasatoSaeki]

I checked no degradation using dlrv2 on my local pc.
And I added some data in PR description.