autoware_universe/launch folder is moved under autoware_launch

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The autoware_universe/launch folder will be is moved to autoware_launch on February 10, 2026.

• 📋 Details: Migrate tier4_xxx_launcher from autoware_universe into autoware_launch #6774

Why this matters:
If you have open PRs that modify files in the autoware_universe/launch directory, you may need to update them to reflect this new structure.

Please take a look at the linked issue for migration details.

cc @paulsohn @technolojin @mitsudome-r @yukkysaito

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The move has been done!