Added section to the migration guide specifically around how to migrate the Microsoft Graph Entity Provider.
Updated current documentation to recommend setting schedule in config rather than code.
Whilst not strictly nessescarry for the migration docs, documenting this way of setting the schedule eases migrations later (since the new backend system only allows setting schedules via config and not code)
Signed-off-by: Alex Crome <afscrome@users.noreply.github.com>
Alex Crome
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