fix(autoware_mpc_lateral_controller): add timestamp and frame ID to published trajectory

[kyoichi-sugahara]

Description

In this PR, predicted path calculated using the Frenet coordinate system were added for debug purpose, but they couldn't be visualized in rviz due to missing header information.
added the necessary header information with following modification to resolve this issue.

    frenet_clipped.header.stamp = m_clock->now();
    frenet_clipped.header.frame_id = "map";

How was this PR tested?

tested in psim and confirmed visualization

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.

[TakaHoribe]

Lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 29.14%. Comparing base (1f7122a) to head (8960aeb).
Report is 3 commits behind head on main.

Files	Patch %	Lines
...ontrol/autoware_mpc_lateral_controller/src/mpc.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8164      +/-   ##
==========================================
- Coverage   29.14%   29.14%   -0.01%     
==========================================
  Files        1608     1608              
  Lines      118145   118158      +13     
  Branches    50854    50856       +2     
==========================================
- Hits        34439    34438       -1     
- Misses      74460    74473      +13     
- Partials     9246     9247       +1     

Flag	Coverage Δ		*Carryforward flag
differential	18.57% <0.00%> (?)
total	29.14% <ø> (-0.01%)	⬇️	Carriedforward from 1f7122a

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.