chore(tier4_perception_launch): disable internal traffic light signals

[mkuri]

Description

Disable internal traffic light signals

Tests performed

Confirmed it on an actual vehicle.

Effects on system behavior

Not applicable.

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[TomohitoAndo]

I will remove /dummy if following tickets are solved and introduced to the beta branch.

• https://tier4.atlassian.net/browse/RT0-28827 (TIER IV INTERNAL)
  • The setting that gives priority to V2I results is not reflected
• https://tier4.atlassian.net/browse/RT0-28838 (TIER IV INTERNAL)
  • The traffic signal result from perception source was not reflected in the test environment

[TomohitoAndo]

LGTM