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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/getOrBuildFir/declarations/ktij23263.txt

@@ -0,0 +1,17 @@
+KT element: KtStringTemplateExpression
+FIR element: FirErrorPropertyImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+<ERROR PROPERTY: Destructuring declarations are only allowed for local variables/values>
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] ktij23263.kt
+    public? final? [ResolvedTo(RAW_FIR)] class InitOrderDemo : R|kotlin/Any| {
+        public? [ResolvedTo(RAW_FIR)] [ContainingClassKey=InitOrderDemo] constructor([ResolvedTo(RAW_FIR)] name: String): R|InitOrderDemo| {
+            LAZY_super<R|kotlin/Any|>
+        }
+
+        <ERROR PROPERTY: Destructuring declarations are only allowed for local variables/values>
+
+    }