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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/lazyResolve/substitutionFakeOverrideInDifferentModules.kt

@@ -0,0 +1,11 @@
+// SKIP_WHEN_OUT_OF_CONTENT_ROOT
+// MODULE: m1
+// FILE: AbstractClass.kt
+abstract class AbstractClass<T> {
+    abstract val property: T
+}
+
+// MODULE: m2(m1)
+// MEMBER_NAME_FILTER: property
+// FILE: SubClass.kt
+abstract class S<caret>ubClass: AbstractClass<Int>()