#usd Update third_party/mujoco and third_party/py/mujoco to USD v26

Update USD dependency module paths, includes, Python imports, and plugin registration configurations across third_party/mujoco and third_party/py/mujoco from USD v23 to USD v26.

PiperOrigin-RevId: 963260526
Change-Id: I3778608cb03c8903d0f545c76ae91effba3ec364

src/experimental/usd/plugins/mjcf/mujoco_to_usd.cc

@@ -50,7 +50,6 @@
 #include <pxr/base/vt/types.h>
 #include <pxr/base/vt/value.h>
 #include <pxr/usd/kind/registry.h>
-#include <pxr/usd/sdf/abstractData.h>
 #include <pxr/usd/sdf/assetPath.h>
 #include <pxr/usd/sdf/declareHandles.h>
 #include <pxr/usd/sdf/path.h>

src/experimental/usd/utils.cc

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// clang-format off
 #include <cstddef>
 #include <string>
 
@@ -21,8 +22,10 @@
 #include <dlfcn.h>
 #endif
 #include <pxr/base/plug/registry.h>
+// clang-format on
 
 #include <mujoco/experimental/usd/utils.h>
+
 #include <mujoco/mujoco.h>
 #include <pxr/usd/sdf/path.h>
 

src/experimental/usd/writer.cc

@@ -18,8 +18,8 @@
 #include <vector>
 
 #include <mujoco/experimental/usd/utils.h>
-#include "experimental/usd/plugins/mjcf/mujoco_to_usd.h"
 #include <mujoco/mujoco.h>
+#include "experimental/usd/plugins/mjcf/mujoco_to_usd.h"
 #include <pxr/usd/sdf/path.h>
 #include <pxr/usd/usd/common.h>
 #include <pxr/usd/usd/stage.h>