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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/getOrBuildFir/annotations/useSite/delegateScript.kts

@@ -0,0 +1,8 @@
+// LOOK_UP_FOR_ELEMENT_OF_TYPE: org.jetbrains.kotlin.psi.KtAnnotationEntry
+
+annotation class Ann
+
+class X {
+    <expr>@delegate:Ann</expr>
+    val a by lazy { 1 }
+}