Remove record/replay/bug report functionality from the tool

[jonahwilliams]

Description

This functionality is neither actively used nor sufficiently tested. While record/replay functionality sounds useful, the fact that we haven't put it to any use in the past year suggests that it might not be.

Running with --bug-report or any recording crashes almost immediately with:

#0      FutureReference.value.<anonymous closure> (package:file/src/backends/record_replay/result_reference.dart:79:11)
#1      _rootRunUnary (dart:async/zone.dart:1134:38)
#2      _CustomZone.runUnary (dart:async/zone.dart:1031:19)
#3      _FutureListener.handleValue (dart:async/future_impl.dart:140:18)
#4      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#5      Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#6      Future._completeWithValue (dart:async/future_impl.dart:526:5)
#7      Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:556:7)
#8      _rootRun (dart:async/zone.dart:1126:13)
#9      _CustomZone.run (dart:async/zone.dart:1023:19)
#10     _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#11     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:965:23)
#12     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#13     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#14     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#15     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:175:5)

Instead of record/reply, we've gotten significant mileage in the tool out of mocks and fakes for testing

[zanderso]

I am supportive of removing things we don't use/need, but maybe @tvolkert can share an anecdote or two about times this was useful to have around.

[tvolkert]

It has indeed proved useful a small handful of times in the past - not for record/replay tests (which ended up being fraught with gotchas), but for user bug reports.

I'd support adding this back in a more fully fleshed out form to support a bug report capture in the flutter tool, but I agree that the current code has bit rotted to the point that it should be removed.

[jonahwilliams]

Filled #46018 to track