[Backend Tester] Add index_put and index_select tests

backends/test/harness/tester.py

@@ -311,7 +311,10 @@ def run_method_and_compare_outputs(
         print(f"Comparing Stage {stage} with Stage {reference_stage}")
         for run_iteration in range(number_of_runs):
             inputs_to_run = inputs if inputs else next(self.generate_random_inputs())
-            input_shapes = [generated_input.shape for generated_input in inputs_to_run]
+            input_shapes = [
+                generated_input.shape if hasattr(generated_input, "shape") else None
+                for generated_input in inputs_to_run
+            ]
             print(f"Run {run_iteration} with input shapes: {input_shapes}")
 
             # Reference output (and quantization scale)