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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/inBlockModification/entireContractScript.kts

@@ -0,0 +1,9 @@
+import kotlin.contracts.InvocationKind
+
+inline fun foo(block: () -> Unit) {
+    <expr>kotlin.contracts.contract {
+        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
+    }</expr>
+
+    block()
+}