[LL FIR] rename testdata to testData to avoid copyright generation

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/classId/enumEntry.kt

@@ -0,0 +1,14 @@
+package one
+
+/* ClassId: one/MyEnum */enum class MyEnum {
+    /* ClassId: null */Entry {
+        fun foo() = Unit
+        /* ClassId: null */class ClassInsideEntry
+    },
+    /* ClassId: null */Entry2,
+    /* ClassId: null */Entry3 {
+
+    }
+}
+
+// IGNORE_CONSISTENCY_CHECK: KtEnumEntry have FqName, but doesn't have ClassId