Resolve "Add support for RHEL 9 and compatible clones"

Closes #6373

See merge request !1656

Match conversion from strftime to date got php 8

See merge request !1652

Fix undefined variable firewall_server_enabled and xmpp_server_enabled, #6400

See merge request !1653

Fix undefined $postfix_version and generalize code, #6405

Closes #6405

See merge request !1654

Fix undefined $conf, #6406

Closes #6406

See merge request !1655

Fixed Wrong DNS Validation #6357

See merge request !1616

Added validator for listname Fix #6362

Closes #6362

See merge request !1617

Collected minor correction/ translation fixes

See merge request !1646

Add content name to page title for edit forms, #6401

Closes #6401

See merge request !1648

Merge branch '6313-add-warning-to-update-script-when-incorrect-php-version-is-used-as-default' into 'develop'

Resolve "Add warning to update script when incorrect PHP version is used as default"

Closes #6313

See merge request !1647

Resolve "PHP warnings in Installer on PHP 8.1"

Closes #6398

See merge request !1643

Fix apps vhost tpl symlink

See merge request !1642

Source /etc/profile from cron.sh

See merge request !1640

Resolve "apps vhost template file error in dev"

Closes #6397

See merge request !1641