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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/lambdaAsSAMInterface.kt

@@ -0,0 +1,13 @@
+package foo
+
+class Arg
+
+fun interface Foo {
+    fun foo(a: Arg): Arg
+}
+
+fun testMe(f: Foo) {}
+
+fun resolve<caret>Me() {
+    testMe { b -> b }
+}