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

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

@@ -0,0 +1,9 @@
+// See EA-73584
+data class<!SYNTAX!><!> {
+
+}
+
+// See KT-9296
+data interface<!SYNTAX!><!> {
+
+}