[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/nestedClassScript.txt

@@ -0,0 +1,35 @@
+KT element: KtClass
+FIR element: FirRegularClassImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+public final [ResolvedTo(BODY_RESOLVE)] class X : R|kotlin/Any| {
+    public [ResolvedTo(BODY_RESOLVE)] [ContainingClassKey=X] constructor(): R|Y.X| {
+        super<R|kotlin/Any|>()
+    }
+
+    public final [ResolvedTo(STATUS)] fun y(): R|kotlin/String|
+
+}
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] nestedClassScript.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(STATUS)] class Y : R|kotlin/Any| {
+            public [ResolvedTo(STATUS)] [ContainingClassKey=Y] constructor(): R|Y| {
+                LAZY_super<R|kotlin/Any|>
+            }
+
+            public final [ResolvedTo(BODY_RESOLVE)] class X : R|kotlin/Any| {
+                public [ResolvedTo(BODY_RESOLVE)] [ContainingClassKey=X] constructor(): R|Y.X| {
+                    super<R|kotlin/Any|>()
+                }
+
+                public final [ResolvedTo(STATUS)] fun y(): R|kotlin/String|
+
+            }
+
+        }