Use the bug snapshot transform in the "uplift" model about bugbug HOT 6 CLOSED

Hi.
I would like to work on this issue.
Previously I have not made any contributions to any open source community.
It would be great if you could help me get started.

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To fix this issue, we'll need to do something similar to 2a44029, but for the uplift model. We'd need to rollback to the time the uplift request was accepted or rejected.

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@marco-c How to test if i've made correct changes for this issue?

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@chidauri make sure you can run the model, and write some tests similar to those in #189.

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@marco-c The rollback should be done to the time when anything beginning with approval-mozilla was added to the change, right?

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We have to rollback to the time when the uplift was accepted (approval-mozilla-XXX == +) or rejected (approval-mozilla-XXX == -), but we don't have to rollback to when the uplift was requested (approval-mozilla-XXX == ?).

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