Do not emmit confusing warning from FusionOptimizer by default

pytensor/tensor/rewriting/elemwise.py

@@ -699,11 +699,9 @@ class FusionOptimizer(GraphRewriter):
                     if node.op.scalar_op.supports_c_code(node.inputs, node.outputs):
                         return True
                     else:
+                        if config.optimizer_verbose:
                             warn(
-                            "Optimization Warning: "
-                            f"The Op {node.op.scalar_op} does not provide a C implementation."
-                            " As well as being potentially slow, this also disables "
-                            "loop fusion."
+                                f"Loop fusion interrupted because {node.op.scalar_op} does not provide a C implementation."
                             )
                         return False