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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/functions/functionCallWithGenericResult.kt

@@ -0,0 +1,9 @@
+open class Foo<T : CharSequence>
+
+fun bar(): Foo<String>? {
+    return null
+}
+
+fun resolve<caret>Me() {
+    val x = bar()
+}