[FIX] website: add a robust utility to enter in edit mode
This commit creates a new util which clicks on edit and waits for the
edit mode to be started. This way, we make sure that the edit mode is
enabled before testing the next step of the test. This avoids race
conditions during tests.
Note that we leave the old clickOnEdit util as it could be used in
custom codes and we don't want to break them.
task-3203820
closes odoo/odoo#116490
Signed-off-by:
Romain Derie (rde) <rde@odoo.com>