Apply fix from dotnet#34729 to Cosmos SqlExpressionFactory to keep it…

… in sync

src/EFCore.Cosmos/Query/Internal/SqlExpressionFactory.cs

@@ -156,7 +156,7 @@ private SqlExpression ApplyTypeMappingOnSqlBinary(
             case ExpressionType.Coalesce:
             {
                 inferredTypeMapping = typeMapping ?? ExpressionExtensions.InferTypeMapping(left, right);
-                resultType = inferredTypeMapping?.ClrType ?? left.Type;
+                resultType = inferredTypeMapping?.ClrType ?? (left.Type != typeof(object) ? left.Type : right.Type);
                 resultTypeMapping = inferredTypeMapping;
                 break;
             }