feat(autoware_overlay_rviz_plugin): add Last-in priority for turn signal and hazard light

[shtokuda]

Description

The current plugin prioritizes the hazard lights. We've added a new mode to the turn signal and hazard light logic that gives priority to the most recent 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

❌ Patch coverage is 0% with 41 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@5f02b1b). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...e_overlay_rviz_plugin/src/turn_signals_display.cpp	0.00%	31 Missing ⚠️
...utoware_overlay_rviz_plugin/src/signal_display.cpp	0.00%	10 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             main     #23   +/-   ##
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  Coverage        ?   0.00%           
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  Files           ?       9           
  Lines           ?     691           
  Branches        ?      48           
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  Hits            ?       0           
  Misses          ?     691           
  Partials        ?       0           

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

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