[IMP] *: remove widget='selection' from many2one fields

Currently, across Odoo, there are around 40+ many2one fields defined with a
'selection' widget. Since the many2one widget has options to limit record
creation and opening, there is no reason to define a many2one field with a
selection widget. The selection widget does not allow for searching, and is
limited to 100 records.

PURPOSE
to update the definition of any many2one on which we applied a 'selection'
 widget, and instead use the standard many2one widget with disabled
opening/creation instead.

after this commit,
for each many2one field defined with widget="selection",  widget="selection" is
replaced with options="{'no_open': True, 'no_create': True}"

Task : 2476488

closes odoo/odoo#68387

Related: odoo/enterprise#17316
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>