R1:b04f706c0af6

Use TransactionEditor when closing revisions in response to commits

Summary: Ref T2222. When we discover a commit associated with a revision, close it using modern transactions.

Test Plan: {F123848}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2222

Differential Revision: https://secure.phabricator.com/D8441