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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/localFunctionInsideFunctionLiteralScript.kts

@@ -0,0 +1,8 @@
+package one
+
+open class ClassWithParameter(i: () -> Unit)
+
+class TopLevelClass : ClassWithParameter({
+    fun fo<caret>o(param: String) {
+    }
+})