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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/secondaryConstructorParameterScript.kts

@@ -0,0 +1,7 @@
+class A(val prop: Int = 42, c: String) {
+    constructor(st<caret>r: String) : this(str.myToInt(), str)
+
+    fun foo() = "str"
+}
+
+fun String.myToInt(): Int = 42