[MM-40735] Add MattermostAppID to OAuth app (#19214)

db/migrations/postgres/000078_create_oauth_mattermost_app_id.down.sql

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+ALTER TABLE OAuthApps DROP COLUMN IF EXISTS MattermostAppID;

db/migrations/postgres/000078_create_oauth_mattermost_app_id.up.sql

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+ALTER TABLE OAuthApps ADD COLUMN IF NOT EXISTS MattermostAppID varchar(32);