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

We exclude testData pattern from copyright scope

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

@@ -0,0 +1,6 @@
+annotation class Anno(val s: String)
+
+@Deprecated("function") @Anno("function")
+fun f<caret>ooo(@Deprecated("a") @Anno("a") a: Int) {
+
+}