[FIX] google_calendar: prevent useless partners creation

When syncing with a Google account, if user's email is different from
Google account, the server creates a new partner. Moreover, the synced
event are not linked to the current partner.

To reproduce the error:
1. Have two Google accounts GA01 and GA02
2. With GA01, add an event to Google Calendar and add GA02 to guests
3. In Odoo, sync with Google Calendar using GA02
	- The partner linked to the current Odoo user must have an email
different from GA02's email

Error: The calendar is synced, but the user needs to check "Everybody's
calendars" to see the synced events. A new partner has been created
using GA02's email. The synced events are linked to this new partner
instead of current user's partner (`self.env.user.partner_id`).
Moreover, Google event's organizer is always added to attendees but, if
it this is indeed the case (so if the organizer is also an attendee),
`google_event.attendees` already contains this organizer.

OPW-2440033

closes odoo/odoo#65216

Signed-off-by: Adrien Widart <adwid@users.noreply.github.com>

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