[debug-wrapper] migrate some scope related tests

test/debugger/debug/ignition/debug-step-prefix-bytecodes.js

 // Copyright 2011 the V8 project authors. All rights reserved.
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-// Flags: --ignition-filter=f --expose-debug-as debug
+// Flags: --ignition-filter=f
 
 // This test tests that full code compiled without debug break slots
 // is recompiled with debug break slots when debugging is started.
 
-// Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 var done = false;
 var step_count = 0;
 var values = [];
 
 // Debug event listener which steps until the global variable done is true.
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.Break) {
     if (!done) exec_state.prepareStep(Debug.StepAction.StepNext);
@@ skipping 322 matching lines @@
 f();
 check_values();
 assertEquals(580, step_count);
 Debug.clearBreakPoint(bp);
 
 // Pass 3 - debugger attached and no BP
 prepare_step_test();
 f();
 check_values();
 assertEquals(0, step_count);