feat(hazard_status_converter): hazard status converter subscribe emergency holding

[TetsuKawa]

Description

This PR add emergency holding subscriber and update emergency_holding which is in hazard_status topic .

Related links

Parent Issue:

• CompanyName internal link
• tier4_autoware_msgs PR link

How was this PR tested?

Please refer to the parent PR.

Notes for reviewers

None.

Interface changes

Topic changes

Additions and removals

Change type	Topic Type	Topic Name	Message Type	Description
Added	Sub	/system/emergency_holding	tier4_system_msgs/msg/EmergencyHoldingState	indicates whether mrm is in the emergency_holding state

Effects on system behavior

None.

[github-actions]

Thank you for contributing to the Autoware project!

🚧 If your pull request is in progress, switch it to draft mode.

Please ensure:

• You've checked our contribution guidelines.
• Your PR follows our pull request guidelines.
• All required CI checks pass before marking the PR ready for review.