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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/errorResistance/builderInference.kt

@@ -0,0 +1,12 @@
+// WITH_STDLIB
+
+import broken.lib.Foo
+
+fun test() {
+    buildList {
+        add(1)
+        add(Foo("foo", 1).result)
+    }
+}
+
+fun <T> consume(a: T) {}