[FIX] sale: only create one activity to upsell a SO

Create a Sale Order linked to a timesheet, for k hours.
Add the a line for the k hours, invoice the SO.
Then, next time you add a line or modify the value of an existing line,
the SO invoice_status becomes "upselling".
Then, everytime you do it again, it triggers a recompute which writes the
invoice_status "upselling" on the SO.

Now since commit 17c9b7afee219e86e48035044570939a70fb18f3 every time you write
an invoice_status as "upselling" this creates a new activity to upsell the SO.
However it was intended to run only once, the first time the status changes.

Before creating an activity, we check what was the invoice_status to ignore
records that were already in that state.

opw 1911642
opw 1919283
opw 1919284

closes odoo/odoo#29891

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