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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/properties/hierarchyWithOverrideScript.kts

@@ -0,0 +1,16 @@
+interface Foo1 {
+    fun foo()
+    fun bar()
+    val str: String
+}
+
+interface Foo2 : Foo1 {
+    fun foo(i: Int)
+    fun bar(s: String)
+    val isBoo: Boolean
+}
+
+abstract class Usage : Foo2 {
+    override fun foo() {}
+    override val s<caret>tr = ""
+}