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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/getOrBuildFir/wholeDeclaration/localFunctionScript.txt

@@ -0,0 +1,21 @@
+KT element: KtNamedFunction
+FIR element: FirSimpleFunctionImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+local final [ResolvedTo(BODY_RESOLVE)] fun x(): R|kotlin/String| {
+    ^x String()
+}
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] localFunctionScript.kts
+    context(<script>@R|kotlin/script/templates/standard/ScriptTemplateWithArgs|)
+    SCRIPT: [ResolvedTo(TYPES)] 
+        [ResolvedTo(RAW_FIR)] lval args: R|kotlin/Array<kotlin/String>|
+
+        public final [ResolvedTo(BODY_RESOLVE)] fun y(): R|kotlin/Unit| {
+            local final [ResolvedTo(BODY_RESOLVE)] fun x(): R|kotlin/String| {
+                ^x String()
+            }
+
+        }