[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/annotationApplicationArgument.txt

@@ -0,0 +1,20 @@
+KT element: KtValueArgument
+FIR element: FirConstExpressionImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+String(y)
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] annotationApplicationArgument.kt
+    public final [ResolvedTo(STATUS)] annotation class Annotation : R|kotlin/Annotation| {
+        public [ResolvedTo(STATUS)] [ContainingClassKey=Annotation] constructor([ResolvedTo(STATUS)] [CorrespondingProperty=/Annotation.name] name: R|kotlin/String|): R|Annotation| {
+            LAZY_super<R|kotlin/Any|>
+        }
+
+        public final [ResolvedTo(STATUS)] [IsFromPrimaryConstructor=true] val name: R|kotlin/String| = R|<local>/name|
+            public [ResolvedTo(STATUS)] [ContainingClassKey=Annotation] get(): R|kotlin/String|
+
+    }
+    @R|Annotation|[Types](name = String(y)) public final [ResolvedTo(ANNOTATIONS_ARGUMENTS_MAPPING)] fun x(): R|kotlin/Unit| {
+    }