[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/useSite/file.txt

@@ -0,0 +1,17 @@
+KT element: KtAnnotationEntry
+FIR element: FirAnnotationCallImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+@FILE:R|Ann|[Types]()
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] file.kt
+    @FILE:R|Ann|[Types]()
+    [ResolvedTo(BODY_RESOLVE)] annotations container
+    public final [ResolvedTo(STATUS)] annotation class Ann : R|kotlin/Annotation| {
+        public [ResolvedTo(STATUS)] [ContainingClassKey=Ann] constructor(): R|Ann| {
+            LAZY_super<R|kotlin/Any|>
+        }
+
+    }