[FIX] payment_*: tests

PAYPAL
------

The paypal tests are not working working for two reasons:
- we check that there is no date in pending state on payment
transaction, but since the refactoring in this commit: https://github.com/odoo/odoo/commit/01216345e28374b554bfe95df82d607c591271cf
the date is always set before the validation of transaction.
- Since the changes on dates, the datetime field doesn't return a string
anymore and the comparison fails. So we convert the datetime to string
for the comparison.

BUCKAROO
--------

The buckaroo tests were not working for multiple reasons.

STRIPE
------

The payment stripe tests were not working because:
- The reference set in transactions were not the same as the ones givent
to the payment provider.
- we were checking for a script tag in form that has been removed in
commit https://github.com/odoo/odoo/commit/7c639be4aadce20bf6662ab347470fadf9afd99f

AUTHORIZE
---------

This test cannot be tested on runbot due to its server to server way of
working

closes odoo/odoo#30105

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