Add Unitree H1_2 description

[TonyZYT2000]

Add Unitree H1_2 description (URDF & MJCF).

[stephane-caron]

Thank you for adding this description 👍 It looks like the URDF CI tests fail because the G1 description's URDF path has changed in the unitree_ros repository:

• iDynTree: 2025-07-18T08:51:40.5514135Z ..I/O warning : failed to load external entity "/home/runner/.cache/robot_descriptions/unitree_ros/robots/g1_description/g1.urdf"
• Pinocchio: 2025-07-18T09:02:48.0588814Z ...Error: File /home/runner/.cache/robot_descriptions/unitree_ros/robots/g1_description/g1.urdf does not exist

Can yuo update the G1's URDF path to the newer file name? (I believe it should be g1_29dof.urdf.)

[TonyZYT2000]

Thanks for pointing it out. The new filename is indeed g1_29dof.urdf at the same path.

[coveralls]

Pull Request Test Coverage Report for Build 16380385845

Details

• 13 of 13 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 98.124%

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Totals
Change from base Build 16294694272:	0.02%
Covered Lines:	1203
Relevant Lines:	1226

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💛 - Coveralls