Big change in quickfix tests: no stupid test data format with "before" and "after" file prefixes

idea/testData/quickfix/migration/addOverrideToEqualsHashCodeToString.kt

@@ -0,0 +1,29 @@
+// "Add 'override' to equals, hashCode, toString in project" "true"
+
+class A {
+    fun <caret>equals(other: Any?) = false
+    fun hashCode() = 0
+    fun toString(): String {
+        return "A"
+    }
+}
+
+class B {
+    open fun equals(other: Any?) = false
+    open fun hashCode(): Int {
+        return 42
+    }
+    open fun toString() = ""
+}
+
+class C {
+    public fun equals(other: Any?): Boolean = true
+    public fun hashCode() = 0
+    public fun toString() = ""
+}
+
+class D {
+    public open fun equals(o: Any?) = false
+    public open fun hashCode(): Int = 239
+    public open fun toString() = ""
+}