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

We exclude testData pattern from copyright scope

analysis/low-level-api-fir/testData/fileBasedDeclarationProvider/sameNames.kt

@@ -0,0 +1,29 @@
+// CLASS: test/Foo
+// CLASS: test/Bar
+// CLASS: test/Bar.Baz
+// CLASS: test/Bar.Boo
+// CLASS: test/Bar.Bok
+// FUNCTION: test/#foo
+// PROPERTY: test/#foo
+
+package test
+
+class Foo
+interface Foo
+typealias Foo = Foo
+enum class Foo
+
+class Bar {
+    class Baz
+    object Boo
+}
+
+interface Bar {
+    object Baz
+    interface Bok
+}
+
+fun foo() {}
+fun foo(a: Int) {}
+
+val foo: String = "foo"