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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/contextCollector/smartCasts/andRight.kt

@@ -0,0 +1,11 @@
+interface Foo {
+    val isValid: Boolean
+}
+
+fun test(obj: Any) {
+    if (obj is Foo && <expr>obj.isValid</expr>) {
+        consume(obj)
+    }
+}
+
+fun consume(obj: Foo) {}