…form open

* By default (can be disabled), if replay integration exists, start buffering
* Flush replay when the feedback form is first opened instead of at submit time

We are making this change because we have noticed a lot of feedback replays only consist of the user submitting the feedback and not what they did prior to submitting feedback. This may result in false positives if users open but do not submit feedback, but this should make replays from feedback more useful.