update Vault notification email with SWH-ID

Change the email notification with SWH-ID: swh:1:dir: 00b4bcdff80e8b3c180e481c76709fc876958b8a

Instead of: Object Type: directory Object ID: 00b4bcdff80e8b3c180e481c76709fc876958b8a

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Migrated from T2282 (view on Phabricator)