AN OPEN LABEL, MULTICENTER, RANDOMIZED DOSEESCALATION AND EXTENSION, PHASE IA/IB STUDY TO EVALUATE SAFETY AND ANTI-TUMOR ACTIVITY OF RO7284755, A PD-1 TARGETED IL-2 VARIANT (IL-2V) IMMUNOCYTOKINE, ALONE OR IN COMBINATION WITH ATEZOLIZUMAB IN PARTICIPANTS WITH ADVANCED AND/OR METASTATIC SOLID TUMORS