Add a lock to storage upgrade and adjustment
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Description Add a lock to storage upgrade and adjustment Summary: Fixes T9715. Adds a MySQL-based lock to ensure that schema migrations are not applied on multiple hosts simultaneously. Test Plan: Ran ./bin/storage upgrade concurrently. One invocation was successful whilst the other hit a PhutilLockException. Reviewers: #blessed_reviewers, epriestley Subscribers: Korvin Maniphest Tasks: T9715 Differential Revision: https://secure.phabricator.com/D14463
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