automation_worker: update pull request with backout information (Bug 2024925) #1325 (lando@main)

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Branches magnolia/bug-2024925-updating-pr-with-backout-info -> main
Repo lando@main (git) (git://github.com/mozilla-conduit/lando.git)
Author Magnolia-Liu
State open
Commit Title

automation_worker: update pull request with backout information (Bug 2024925)

Commit Body

In Phabricator, when a revision is backed out, it is updated with the commits and is reopened so it's clear the change was reverted. Implement something similar: The AutomationWorker now detects reverts among the commits it lands and comments on the affected pull requests. This is comment-only for now. Reopening the reverted pull request can be implemented in a follow-up bug.

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