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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/compilationPeers/functionCallDeep.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// FILE: base.kt
+package base
+
+inline fun base() {}
+
+// FILE: lib.kt
+package lib
+
+import base.*
+
+inline fun lib() {
+    base()
+}
+
+// FILE: main.kt
+package test
+
+import lib.*
+
+fun foo() {
+    lib()
+}