Simplify reverts of forwarding state on acknowledgement

[DimitrisJim]

Investigate if we can simplify revert logic by doing regular refund packet tokens first and then the logic for revert forwarding changes.

Surfaced during internal walkthrough of ics20 v2 forwarding (commit efcfa5d)

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[crodriguezvega]

Looks like it should be possible. Opened cosmos/ibc#1110 to update the spec.

[srdtrk]

I can take this if others agree

[DimitrisJim]

absolutely, go for it

[srdtrk]

There was a suggestion to remove the state stored in GetForwardedPacket after revert logic is done. Should I create a new issue for this or address it in #6474?

I think we could also switch to using a collections item. Could also create an issue for that

[DimitrisJim]

I think follow up would be better? No need to add to diff.

Also, re collection item, should add it as an additional thing to migrate in #6404. Think it makes sense to just reword that issue to mention migrating all transfer state to collections.

[srdtrk]

closed by #6574