[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/dataClasses/dataClassNotOverridingCopy.fir.kt

@@ -0,0 +1,9 @@
+// !LANGUAGE: +ProhibitDataClassesOverridingCopy
+
+interface WithCopy<T> {
+    fun copy(str: T): WithCopy<T>
+}
+
+data class Test(val str: String, val int: Int) : WithCopy<String> {
+    override fun copy(str: String) = copy(str, int)
+}