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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/contextCollector/innerClasses.kt

@@ -0,0 +1,11 @@
+package test
+
+class Foo<F> {
+    inner class Bar<B> {
+        fun test(f: F, b: B) {
+            <expr>consume(f)</expr>
+        }
+    }
+}
+
+fun consume(obj: Any) {}