[FW][IMP] reference/user_interface: 17.0 odoo ui icons

[fw-bot]

Task: #3912373
[IMP] suggested from #9065 (review)

This PR improves the icons.rst documentation of the Odoo UI icon list by adding the new 17.0 icons as well as the RTL adaptations.

Note: is there a reason to keep the old 16.0 styles for the .oi-close icon? I don't see these styles in the Odoo css:

.oi-close:before {
  content: '\00d7';
  font-family: sans-serif;
  font-weight: bold;
}

Forward-Port-Of: #9256

[robodoo]

[fw-bot]

This PR targets saas-17.2 and is part of the forward-port chain. Further PRs will be created up to master.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port