Adapting software & doc for change #34184 "Forbidden sensitive files extensions on modules directory"

[matks]

Following change #34184 multiple changes need to be done for 9.0.0

1. Make the change crystal clear in the documentation "Notable changes in 9.0.0" to inform PrestaShop users broadly

2. Update the project modules that do not comply to this rule

• ps_imageslider module has a file ajax_ps_imageslider.php Use AdminController ps_imageslider#96
• ps_wirepayment module has a file payment.php and validation.php Delete deprecated files and bump version ps_wirepayment#84 + Release 2.2.0 ps_wirepayment#85
• ps_facetedsearch module has 3 files ps_facetedsearch-attribute-indexer.php, ps_facetedsearch-clear-cache.php and ps_facetedsearch-price-indexer.php Deprecate standalone endpoints to match PrestaShop 9.0 new security policy ps_facetedsearch#983 + Release 3.15.0 ps_facetedsearch#981
• gsitemap module has a file gsitemap-cron.php Add controller for CRON tasks and minor fixes gsitemap#175 + Release version 4.4.0 gsitemap#176
• ps_checkpayment module has a file payment.php Bump to 2.1.0 and remove payment.php ps_checkpayment#64 + Release 2.1.0 ps_checkpayment#65
• ps_emailsubscription has a file verification.php Delete deprecated files and bump version ps_emailsubscription#100 + Release 2.8.0 ps_emailsubscription#101

[matks]

First PR PrestaShop/ps_checkpayment#64

[matks]

Second PR PrestaShop/ps_imageslider#96

[Hlavtox]

Ping @clotairer @jf-viguier, friendly notice ;-)