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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/getOrBuildFir/invalidCode/expectAndActualInTheSameFile.txt

@@ -0,0 +1,15 @@
+KT element: KtCallExpression
+FIR element: FirFunctionCallImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+<Unresolved name: println>#(String(Hello))
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] expectAndActualInTheSameFile.kt
+    public? final? [ResolvedTo(RAW_FIR)] fun main(): R|kotlin/Unit| { LAZY_BLOCK }
+    public? final? expect [ResolvedTo(RAW_FIR)] fun f(): R|kotlin/Unit|
+    public? final? [ResolvedTo(RAW_FIR)] fun test(): R|kotlin/Unit| { LAZY_BLOCK }
+    public final actual [ResolvedTo(BODY_RESOLVE)] [ExpectForActualAttributeKey={}] fun f(): R|kotlin/Unit| {
+        <Unresolved name: println>#(String(Hello))
+    }