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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/properties/getterWithDelegationScript.kts

@@ -0,0 +1,6 @@
+val one: Int by Prp()
+@Deprecated("reason") ge<caret>t
+
+class Prp {
+    fun getValue() = 1
+}