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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/getOrBuildFir/invalidCode/javaClassLiteral.kt

@@ -0,0 +1,6 @@
+fun main(args: Array<String>) {
+    val anyClass = Any()
+    funOne(<expr>anyClass</expr>.class)
+}
+
+fun funOne(x: Any): Unit {}