[IMP] sale, website_quote: allow portal payment after signature

Both features already existed but it was not possible to enable both.
This makes that possible. When both are enabled the quotation first has to be
signed, then it can be paid.

Purpose
=======
No way to combine digital signature and online payments to confirm orders.
A customer signature matters for big deals, in order to keep an official print
of customer agreement.

Specs
=====
- when the customer signs online, a new pdf is generated with the customer
  signature on it and posted as a note in the chatter, replacing the current
  signature jpg.

- show the signature in the portal view, with both sale_management and
  website_quote module

- change in settings: Digital Signature and Electronic Payment are now 2
  checkboxes instead of a radio button

- these settings must be company-specific (add company icon if multi-companies,
  like other company-specific settings)

- when both modes are activated, it first request the signature, then the
  payment

- the order is confirmed after payment

opw-1818837
Closes #24174

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