82e92cbcaa
MujocoTest now loads plugins from MUJOCO_PLUGIN_DIR if set. PluginTest is removed; all tests use MujocoTest directly. testspeed binary loads plugins from MUJOCO_PLUGIN_DIR. This is in preparation for moving common asset format parsing (obj, msh, stl, etc.) where we will always want to load those plugins. PiperOrigin-RevId: 874194428 Change-Id: Id90805a9ba5de4627911b56d8b9c4ab4e1b29310