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

We exclude testData pattern from copyright scope

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

@@ -0,0 +1,8 @@
+fun resolve<caret>Me() {
+    receive(withGetter)
+}
+
+fun receive(value: Int){}
+
+val withGetter: Int
+    get() = 42