chore: remove unused repl-related configuration and placeholder files

repl/tests/test_multiline.txt

@@ -0,0 +1,22 @@
+class Person {
+public String name;
+public int age;
+public Person(String n, int a) {
+this.name = n;
+this.age = a;
+}
+public String describe() {
+return this.name + " is " + this.age + " years old";
+}
+}
+Person p = new Person("Alice", 30);
+p.name
+p.age
+p.describe()
+int compute(int x,
+int y,
+int z) {
+return x + y + z;
+}
+compute(1, 2, 3)
+%quit