[ON-HOLD] Support multi-GEN0 testing in simulation

[Syed-Abbas-Hussain]

Description:
We need to extend the simulation setup so that multiple GEN0 vehicles can be spawned and tested in the same world. This will help evaluate multi-agent scenarios such as navigation, coordination, and collision avoidance.

Tasks:

• Update launch files to support spawning multiple GEN0 instances.
• Ensure each GEN0 has unique namespaced topics (e.g., /gen0_1/cmd_vel, /gen0_2/cmd_vel).
• Verify that TF frames are properly namespaced and do not conflict.
• Test interaction of multiple GEN0s in the simulation environment.