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Modernize "mailKey" on AlamnacService

Description

Modernize "mailKey" on AlamnacService

Summary: Ref T13641. Ref T13065. Migrate and drop the onboard "mailKey" column for Almanac Services.

Test Plan: Ran storage migration, got clean report, saw migrated value in mail properties table.

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Maniphest Tasks: T13641, T13065

Differential Revision: https://secure.phabricator.com/D21629