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

We exclude testData pattern from copyright scope

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

@@ -0,0 +1,14 @@
+import kotlin.contracts.contract
+
+class A {
+    var x: Int
+    get() {
+        contract {
+            req
+        }
+
+        fun <expr>doSmth</expr>(i: String) = 4
+        return doSmth("str")
+    }
+    set(value) = Unit
+}