[FIX] project: fix infinite recurring tasks creation

for repeat_type = 'forever' recurrences.

Consider a recurrence creating a task every 15th day of the month.
When the cron runs, it updates the next recurrence dates of the
recurrence.

But currently, the updated "next_recurrence_date" can be set to an
earlier date than today, if the fixed day of the recurring task is
earlier than the current day.

This means that the recurring task to create every 15th of the month
will be created the 15, the 16, the 17, the 18, ... until the next month
begins (no task will be created when the cron runs before the 15th of a
month).

This commit enforces the next recurrence_date to be set after the
current cron run, to ensure a task isn't wrongly created multiple times.

This commit also includes the tests that led to the discovery of this
bug.

closes odoo/odoo#63518

Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

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