[FIX] calendar: Add start week day to weekly recurrence rrule generator + unit test

Issue

	- Install 'Calendar' module
	- Create new event from Calendar view
	- Edit event
	- Set True to 'Recurrent' in options tab
	- Repeat every 2 weeks
	- Until : Number of repetitions 2
	- Save and go back to calendar view

	- Events are shifted (+ 1 week)

Cause

	The rrule.rrule (who create the generator with the recurrence ranges dates) use
	by default `calendar.firstweekday()` as first week day ('wkst').

Solution

	If recurrence frequency is 'weekly', get first week day based on user language,
	and add it as param ('wkst') to the rrule.rrule.

https://dateutil.readthedocs.io/en/stable/rrule.html#classes

opw-2448325

closes odoo/odoo#66265

Signed-off-by: Lucas Lefèvre (lul) <lul@odoo.com>
Co-authored-by: LucasLefevre (lul) <lul@odoo.com>

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